Question

organizing elements worksheet
name:____ date:__ period:____
is the following statement true or false? (1 - 3)

1. mendeleev uses his periodic table to predict the properties of undiscovered elements?
2. the periodic law states that when elements are arranged in order of increasing atomic number, there is a periodic repetition of physical and chemical properties.
3. the subatomic particles that play the key role in determining the properties of an element are electrons.
4. how are elements arranged in the modern periodic table?

a. the atoms are arranged in order by increasing atomic number
b. the atoms are arranged in order by decreasing atomic number
c. the atoms are arranged in order by increasing atomic mass
d. the atoms are arranged in order by decreasing atomic mass

1. classify each of the following elements as a(n) alkali metal, alkaline earth metal, halogen, noble gas, transition metal, or inner transition metal.

rubidium:____ cesium:__ bromine:__ iodine:__ strontium:____
krypton:____ neon:__ chromium:__ mendelevium:____

1. for elements in each of the following groups, how many electrons are in the highest occupied energy level?

group 2a:____ group 5a:__ group 7a:____

1. how many energy levels are in the following elements?

potassium:____ tellurium:__ fluorine:____

Explanation:

1. Mendeleev did use his periodic table to predict properties of undiscovered elements, so it's true.
2. The periodic law indeed states that with elements arranged by increasing atomic number, there is a periodic repetition of physical and chemical properties, so it's true.
3. Electrons play the key role in determining an element's properties as they are involved in chemical bonding.
4. In the modern periodic table, atoms are arranged in order by increasing atomic number (a).
5. Rubidium - alkali metal; Cesium - alkali metal; Bromine - halogen; Iodine - halogen; Strontium - alkaline earth metal; Krypton - noble gas; Neon - noble gas; Chromium - transition metal; Mendelevium - inner - transition metal.
6. Group 2A has 2 electrons in the highest occupied energy level; Group 5A has 5; Group 7A has 7.
7. Potassium has 4 energy levels; Tellurium has 5; Fluorine has 2.

Answer:

1. True
2. True
3. Electrons
4. a. The atoms are arranged in order by increasing atomic number
5. Rubidium: alkali metal

Cesium: alkali metal
Bromine: halogen
Iodine: halogen
Strontium: alkaline earth metal
Krypton: noble gas
Neon: noble gas
Chromium: transition metal
Mendelevium: inner - transition metal

1. Group 2A: 2

Group 5A: 5
Group 7A: 7

1. Potassium: 4

Tellurium: 5
Fluorine: 2