Question

atomic structure practice
directions: use what you learned to answer the following questions.

1. rutherfords gold foil experiment led to the conclusion that an atom is mostly empty space with a dense positive center called the nucleus.
2. a neutral sodium atom has 11 electrons. how many protons does sodium have? 11
3. and are two subatomic particles that contribute to almost all of the atoms mass, but collectively occupy a negligible amount of its total volume.
4. the nucleus of an atom, composed of protons and neutrons, has a net electrical charge.
5. what are the subatomic particles in an atom? check all that apply.

a. proton
b. megatron
c. neutron
d. electron

1. which statement correctly describes the properties of an electron?

a. it has a positive charge and its mass is similar to a proton.
b. it is found in the nucleus and has a positive charge.
c. it has a negative charge and negligible mass compared to a proton.
d. it has a neutral charge and is found in the nucleus.
word bank
atoms different electrons energy matter
nucleus neutrons negligible purest protons
are the basic unit of all matter which means everything is made up of atoms. remember, is any substance that occupies space and has mass. when groups of the same atoms join, they form elements. elements are the form of any substance that cannot be broken down into smaller or substances through chemical reactions.
we used to think atoms were the smallest particles in the universe, but they are not. atoms can be broken down into smaller, more fundamental particles called protons, neutrons, and electrons. are positively charged subatomic particles found in the nucleus of an atom. are neutral or have no electric charge and are also found in the nucleus of an atom. the of an atom is the dense center of an atom that contains most of the atoms mass. are tiny negatively charged particles found outside the nucleus of an atom. they spin around the nucleus at crazy speeds. the area where they are found are called levels. electrons have a size that scientist dont even consider it as part of an atoms mass which means the mass of an atom depends solely on the protons and neutrons.

Explanation:

• Question 1: Rutherford's Gold Foil Experiment showed atoms have a nucleus (a dense positive center).
• Question 2: In a neutral atom, the number of protons equals the number of electrons. So a neutral sodium atom with 11 electrons has 11 protons.
• Question 3: Protons and neutrons contribute to most of an atom's mass and are in the nucleus (occupying negligible volume compared to the whole atom).
• Question 4: The nucleus has protons (positive charge) and neutrons (no charge), so it has a net positive charge.
• Question 5: Subatomic particles in an atom are proton, neutron, and electron.
• Question 6: Electrons have a negative charge and negligible mass compared to protons.
• Word Bank Fill - in:
• Atoms are the basic unit of matter. Matter is any substance with mass and volume. Elements are the purest form of a substance that can't be broken into smaller or different substances. Protons are positively - charged in the nucleus. Neutrons are neutral in the nucleus. The nucleus is the dense center. Electrons are outside the nucleus. They spin in energy levels. Electrons have a negligible size.

Answer:

1. nucleus
2. 11
3. Protons; neutrons
4. positive
5. a. Proton; c. Neutron; d. Electron
6. c. It has a negative charge and negligible mass compared to a proton.

Word - Bank:
Atoms; matter; purest; different; Protons; Neutrons; nucleus; Electrons; energy; negligible