化学
化学反应、化学计量、分子结构与元素性质。
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write the electron configuration for a neutral atom of boron.
$1s^22s^22p^1$
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which of the following is not a use of test tubes? c. accurately measur…
c. accurately measuring liquids
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pour les deux substances proposées, coche le nom de celle qui contient …
# Explications étape par étape: ## Étape 1: Vérifier la nature des substances pour la première partie Dans la première partie, on compare la liberté de mouvement des particules. P…
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in the center of matterville, there is a place called the nucleus arcad…
The morale of Matterville would be disrupted as the balance between negative electrons and positive protons would be lost.
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please match the electron configuration to the correct element. 2 - 8 -…
None of the given matches are correct.
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atomic basics part a: atomic structure 1. draw five protons in the nucl…
5. Boron 7. The number of protons in an atom 8. The sum of the number of protons and neutrons in an atom 9. The atomic number 10. Neutrons = Atomic mass - Atomic number 11. | Elem…
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which of the following would you use to filter a mixture of sand and wa…
d. funnel and filter paper
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which particles in an atom are found in the nucleus and have no charge?…
A. Neutrons
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10 matching 3 points please match the electron - configuration to the c…
# Explanation: ## Step1: Recall electron - configuration basics The number of electrons in an atom is equal to its atomic number. The electron - configuration notation shows the n…
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part 3: use lewis dot structures to show the covalent bonding in the fo…
1. Lewis structure of $NI_3$: N in the middle with 3 single bonds to I, N has 1 lone - pair and each I has 3 lone - pairs; Structural formula: $N - I_3$ with lone - pairs as dots.…
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what is chemistry the study of? the study of historical events the stud…
The study of what matter is made of, how it's structured, and how it changes or reacts with other substances
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which of the following are examples of things studied in chemistry? mat…
Atoms and molecules
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chemistry shapes the future and enhances our daily lives in various way…
D. All of the above
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part 2: use lewis dot structures to show the ionic bonding in the follo…
1) Formula: $BaO$ 2) Formula: $CaCl_{2}$ 3) Formula: $Al_{2}O_{3}$ 4) Formula: $Na_{2}O$ 5) Formula: $Na_{3}N$ 6) Formula: $Mg_{3}P_{2}$
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10 matching 3 points please match the electron - configuration to the c…
10. 2 - 8 - 3 - 1: Phosphorus 2 - 8 - 17 - 6: Copper 2 - 8 - 18 - 8: (No correct match among given options) 11. Ground state: 2 - 6, 2 - 8 - 3 - 1, 2 - 8 - 18 - 1 Excited state: 2…
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what are chemical reactions? when substances change into new ones with …
The first option: When substances change into new ones with different properties by rearranging their atoms.
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chemistry is present in various aspects of daily life. which of the fol…
D. All of the above
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10 matching 3 points please match the electron configuration to the cor…
2 - 6: Oxygen 2 - 18 - 8 - 1: Copper 2 - 7 - 6: Phosphorus (excited - state) 2 - 8 - 1 - 1: Not in options (excited - state) 2 - 8 - 3 - 1: Not in options (excited - state) 2 - 8 …
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name: drawing ionic and covalent bonds worksheet draw the lewis dot str…
1. Ionic bond, Lewis dot structure: $Na^+[:\ddot{Cl}:]^-$ 2. Covalent bond, Lewis dot structure: $H:\ddot{O}:H$ 3. Covalent bond, Lewis dot structure: $:\ddot{Cl}:\ddot{Cl}:$ 4. I…
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2. in the graph of atomic radius vs. atomic number what trend(s) is/are…
a. Yes, the graph supports that atomic radius is a periodic property as the trend repeats with each period. b. For the next peak in atomic radius, we would expect it for the eleme…
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9 matching 4 points please match the electron - configuration to the co…
2 - 6: Oxygen (O) 2 - 18 - 8 - 1: Copper (Cu) 2 - 7 - 6 (assuming 2 - 8 - 7): Chlorine (Cl) 2 - 8 - 1 - 1 (assuming 2 - 8 - 1): Sodium (Na) 2 - 8 - 3 - 1 (assuming 2 - 8 - 3): Alu…
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6 multiple choice 1 point when an electron ______ energy it falls back …
6. Releases 7. Absorbs 8. First - 2 electrons, Second - 8 electrons, Third - 18 electrons
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multiple choice 1 point when an electron releases energy it falls back …
3. C. Ground 4. E. Photon 5. B. Spectroscope
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you may use your notes on this quiz. you may take it three times and i …
1. Principal Energy Level 2. Excited
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bonding basics worksheet complete the table with the appropriate inform…
| Name of the Element | Atomic Symbol | Total Number of Electrons | Number of Valence Electrons | Electrons Lost/Gained to be Stable | Oxidation Number (any correct option) | | --…
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part 2 use lewis dot structures to show the ionic bonding in the follow…
1. N - Cl - Cl - Cl with a lone - pair on N 2. C - Br - Br - Br - Br 3. H - O - H with 2 lone - pairs on O
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the elements argon, krypton, and xenon are all non - metals. what prope…
Poor conductor of electricity
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the period for bromine is ____________
4
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10. write the symbols or the names for each of these elements: chlorine…
Chlorine: Cl Zn: Zinc Copper: Cu Helium: He Potassium: K Iron: Fe Silver: Ag P: Phosphorus Na: Sodium Ne: Neon Sn: Tin Mercury: Hg
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worksheet: chemical bonding - ionic & covalent remember ionic bond: bet…
| Compound | Element 1 (metal or non - metal) | Element 2 (metal or non - metal) | Bond Type | |----|----|----|----| | $NO_2$ | Non - metal | Non - metal | Covalent | | $NaCl$ | M…
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how do the structures of \we real cool\ and \the negro speaks of rivers…
The conciseness of both poems forces readers to pay close attention to the meaning the words convey.
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9. which has more protons, sulfur or iodine?
Iodine
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8. does hydrogen have more electrons than uranium?
No
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7. does potassium have more electrons than neon?
Yes
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6. is mercury a heavier element than tin?
Yes
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5. does mercury have more protons and electrons than tin?
Yes
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draw lewis structure for, cho₂⁻
The Lewis structure of $CHO_2^-$ has a central carbon bonded to a hydrogen by a single - bond, to one oxygen by a single - bond (with 3 lone - pairs and a negative charge) and to …
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4. how many electrons do the following have? gold____ iron____ copper__…
Gold: 79 Iron: 26 Copper: 29 Uranium: 92
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3. how many protons do the following have? calcium gold copper iron 4. …
Calcium: 20 Gold: 79 Copper: 29 Iron: 26 Gold (electrons): 79 Iron (electrons): 26
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introduction: the periodic table is so named because similar patterns r…
1. Largest atoms: Lower left region Smallest atoms: Upper right region Highest ionization energy: Upper right region Lowest ionization energy: Lower left region Highest electron a…
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a. in your own words, describe hunds first and second rules that descri…
## A. Hund's first rule: Electrons fill empty orbitals first in a sub - level before pairing, with parallel spins. Second rule: Electrons in degenerate orbitals have parallel spin…
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(02.03 mc) the diagram shows four different locations in an atom. which…
B. 2 and 3
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(02.02 lc) ______ is a nonmetal in the periodic table. a mercury b pota…
1. c. Sulfur 2. d. 11 3. d. Group 14
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does your shampoo leave your hair dry or damaged? flat and lifeless? th…
to persuade readers to buy Organi - Goo
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10. investigate: choose electron affinity and select fluorine (f). in t…
- Ruler distance (for F in Gizmo): Can only be determined by performing the Gizmo experiment. - Electron - affinity (for F in Gizmo): Can only be determined by performing the Gizm…
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(02.01 mc) the table shows the charge on three unknown subatomic partic…
c. Both particles A and B
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6. explore: examine other groups and periods in the periodic table to s…
6. Down - group: Decrease; Across - period: Increase 7. Weaker nuclear - electron attraction due to larger radius. 8. Stronger nuclear - electron attraction due to smaller radius.…
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question 13 what would you add to a solution to change its ph from 3 to…
Sodium hydroxide (NaOH)
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question 12 1 pts the addition of hydrochloric acid (hcl) to an aqueous…
O. increase, decrease
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question 10 name this molecule: fructose glycerol glycine (an amino aci…
C. glycine (an amino acid)
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(02.01 mc) the following orbital notation is for which element? 1s 2s 2…
1. B. N 2. A. \(3s^1\)
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2. investigate: select h. in the gizmo, the hydrogen atom is shown next…
The ionization energy decreases as we move down Group 1 from hydrogen (H) to francium (Fr).
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(02.03 mc) the diagram shows four different locations in an atom. which…
d. 2 and 4
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question 7 what happens to the oh- in an aqueous solution when it becom…
C. increases
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question 8 what is this functional group called? amino carboxyl ketone …
hydroxyl
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(02.03 mc) sulfur (s) has an atomic number of 16. what is the electron …
1. B. 1s²2s²2p⁶3s²3p⁴ 2. A. 1s²2s²2p⁶3s²
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(02.03 lc) what is the total number of electrons that can occupy the f …
1. d. 14 electrons 2. a. three, dumbbell 3. b. 2d
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question 5 what is the relationship between the % dye concentration and…
As % Dye Concentration increases the % Light Transmittance decreases.
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question 4 what would be the light transmittance of a 70% dye solution …
<56%
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slowly drag the atom towards the charge. after the electron is removed,…
3. For group 1 elements, as we move down the group, the ionization energy decreases and the distance of the outermost electron from the original position (when an electron is remo…
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2. investigate: select h. in the gizmo, the hydrogen atom is shown next…
For group 1 elements: As we move down the group (from H to Fr), ionization energy decreases and the distance the electron moves to be removed might increase. For period elements (…
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activity b: removing and adding electrons get the gizmo ready: • choose…
As an atom's size (atomic radius) increases, its ability to hold on to its valence electrons decreases because the increased distance between the nucleus and valence electrons wea…
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10. analyze: consider how the number of protons might affect the size o…
10.D. As the attractive force between the nucleus and electrons increases, the electrons are pulled closer to the nucleus, resulting in a decrease in atomic radius across a period…
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adding which ingredient creates a higher fountain? rock salt mentos rew…
# Breve explicación: Los Mentos crean una reacción más violenta con el gas en las bebidas carbonatadas, lo que resulta en una fuente más alta. La sal de roca también puede causar …
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d. how does your answer to the previous question explain the trend in r…
A. Sodium loses an electron, so remaining electrons are pulled in more tightly, making the ion smaller. B. Chlorine gains an electron, increasing electron - electron repulsions an…
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question 1 of 20 which element was first discovered on the sun? uranium…
C. helium
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12) put a checkmark next to matter whether its elements, compounds, or …
Examples: Oxygen (O), Gold (Au): Elements Can be easily separated into individual parts: Mixtures Made of only one type of atom: Elements Examples: Water (H₂O), Carbon dioxide (CO…
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choose two facts about chemical technicians. they can earn a good salar…
They can earn a good salary after earning a two - year degree or certificate. They set up and maintain labs, prepare and test chemical solutions, and prepare reports.
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choose three examples of alloys. brass made of zinc and copper steel ma…
1. brass made of zinc and copper 2. steel made of iron and carbon 3. colored gold made of gold and magnesium
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a mixture of metals is a(n) ____ hybrid fusion admixture alloy
D. alloy
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adding more solute to a solution will ______ the concentration. increas…
A. increase
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__ is the process to weaken or reduce in concentration. empower intensi…
D. Dilution
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____ is a measure of a solute dissolved in a solution. solution concent…
B. Concentration
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7. collect data: beginning with na, record the number of energy levels,…
| Element | Na | Mg | Al | Si | P | S | Cl | Ar | |--|--|--|--|--|--|--|--|--| | Number of energy levels | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | | Number of protons | 11 | 12 | 13 | 14 …
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5) match the definitions with the terms. a substances ability to dissol…
- a substance's ability to dissolve: Solubility - liquid used to dissolve a substance: Solvent - a dissolved substance: Solute - physical combination of substances: Mixture - mixt…
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which two are characteristics of mixtures? each part keeps its properti…
Each part keeps its properties. You usually can easily separate the parts after they are combined.
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what would be the best title for the chart? ?????? - it is uniform, or …
C. Characteristics of a Solution
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what is an example of a mixture? salad salt sugar potassium
A. salad
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a(n) ___ solution is one in which water is the liquid used to dissolve …
A. aqueous
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2. collect data: use the ruler to measure the atomic radii of the group…
3. The atomic radius increases. 4. For elements in the same group, as the number of energy levels increases, the atomic radius increases. 5. The more energy levels an atom has, th…
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3. what is the relationship between the thickness of the book and the a…
1. The radius of hydrogen is 53 pm. 2. The radius of lithium is 167 pm. 3. As the thickness of the book increases, the ability of the magnet to hold on to and attract paper clips …
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part 4 - homework/independent practice 1. what conclusion was a direct …
1. 1) An atom is mostly empty space with a dense, positively charged nucleus. 2. 2) Largely empty space 3. 1) smaller and contains most of the atom’s mass 4. Both models agree tha…
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oil and vinegar salad dressing is a heterogeneous mixture because its c…
4. A compound is a pure substance with elements chemically combined in a fixed ratio, while a mixture has substances not chemically combined and variable composition. 5. A mixture…
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the following would be an example of: 1 - obtain soda water, aspartame …
# Breve explicación: Los pasos enumerados describen cómo llevar a cabo una actividad, especificando cada acción que debe realizarse. Esto corresponde a un procedimiento o conjunto…
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edpuzzle - isotopes & isotope symbols multiple - choice question why is…
because it has 32 neutrons
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slide 7 what type of weathering does each example describe. water disso…
1. Chemical weathering 2. Chemical or physical weathering (more information needed to be certain) 3. Physical weathering 4. Chemical weathering 5. Physical weathering
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edpuzzle - isotopes & isotope symbols multiple - choice question why do…
because it has 6 protons and 8 neutrons.
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8. there are 2850.5 miles between houston, tx and vancouver, canada, si…
$4.5608\times 10^{6}$ m ### 9.
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circle the right answer! some questions have more than one answer! drag…
1. Potential Energy 2. Thermal Energy 3. Nuclear Energy 4. Chemical Energy 5. Velocity
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edpuzzle - isotopes & isotope symbols multiple - choice question we kno…
...have 26 protons ...have an atomic number of 26
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question 7 1 pts slide 6 what is the wearing down of rock through the m…
C. erosion
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fill in the blank: fill in the blanks with the correct vocab term. word…
1. Potential Mechanical 2. Kinetic Mechanical 3. Electrical, Radiant 4. Chemical 5. Nuclear
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question 6 water is made of what two elements? hydrogen and oxygen oxyg…
A. hydrogen and oxygen
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word bank: potential mechanical, chemical, nuclear, kinetic mechanical,…
1. Potential Mechanical 2. Kinetic Mechanical 3. Electrical; Radiant 4. Chemical 5. Nuclear
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question 4 (4 points) questions 3 and 4) identify the independent and d…
Independent Variable: 8. Number of Unpaired Electrons Dependent Variable: 7. Magnetism
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buffering systems have what effect? move ph towards extremes move ph to…
move pH towards neutral
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what happens if you add more carbon dioxide?chemical reactions of carbo…
ocean acidification
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question 9 1 pts water can pile up a short distance above a containers …
high surface tension.
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question 7 1 pts hydrogen bonds form between neighboring water molecule…
the polarity of water molecules.
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question 2 1 pts the overall electrical charge of most atoms is balance…
False