Unit 1: Atomic Structure Review

What is the basic unit of an atom?

• neutron

• electron

• nucleus

• proton

What are the three subatomic particles that make up an atom?

• protons, neutrons, and positrons

• protons, electrons, and quarks

• electrons, photons, and neutrinos

• protons, neutrons, and electrons

What is the atomic number of an atom?

• The atomic number of an atom is the number of protons in the nucleus of the atom.

• The atomic number of an atom is the number of protons and neutrons in the nucleus of the atom.

• The atomic number of an atom is the number of electrons in the nucleus of the atom.

• The atomic number of an atom is the number of neutrons in the nucleus of the atom.

What are isotopes?

• Different types of atoms with different numbers of protons and electrons.

• Different types of atoms with the same number of protons and electrons.

• Different types of molecules with the same number of protons but different numbers of electrons.

• Variants of a particular chemical element with the same number of protons but different numbers of neutrons.

How many electrons can the first energy level of an atom hold?

• 4

• 6

• 8

• 2

What is the maximum number of electrons that can occupy the second energy level of an atom?

• 4

• 6

• 8

• 2

What are valence electrons?

• The total number of electrons in an atom

• The number of electrons in the outermost shell

• The number of electrons in the second shell

• The number of protons in the outermost shell

• 7
• 8
• 9
• 10

How many valence electrons does carbon have?

• 4

• 5

• 6

• 7

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

• 31

• 5

• 15

• 4