Question

part 1: multiple choice (abc) — choose the correct answer

1. which subatomic particle has a positive charge?

a) electron
b) proton
c) neutron

1. what is the charge of an electron?

a) positive
b) negative
c) neutral

1. the number of protons in an atom is called the:

a) mass number
b) atomic number
c) average atomic mass

1. which part of an atom contains most of its mass?

a) electron cloud
b) nucleus
c) valence shell

1. what is the main purpose of the periodic table?

a) to organize elements by atomic number
b) to list chemical formulas
c) to show only metals

1. what are quarks?

a) subatomic particles that make up protons and neutrons
b) electrons in the outer shell
c) the energy levels of atoms

1. which of the following is not found in the nucleus?

a) protons
b) neutrons
c) electrons

Explanation:

1. Protons are positively - charged subatomic particles.
2. Electrons have a negative charge.
3. The number of protons in an atom is its atomic number.
4. The nucleus contains most of an atom's mass as protons and neutrons are in the nucleus and have significant mass compared to electrons.
5. The main purpose of the periodic table is to organize elements by atomic number.
6. Quarks are subatomic particles that make up protons and neutrons.
7. Electrons are in the electron - cloud outside the nucleus, while protons and neutrons are in the nucleus.

Answer:

1. b) Proton
2. b) Negative
3. b) Atomic number
4. b) Nucleus
5. a) To organize elements by atomic number
6. a) Subatomic particles that make up protons and neutrons
7. c) Electrons