Atoms Assessment

Which subatomic particle has a positive charge?

• Electron

• Neutron

• Proton

• Nucleus

What is the atomic number of an atom?

• The number of protons in the nucleus

• The number of electrons in the atom

• The number of neutrons in the atom

• The number of valence electrons in the atom

What is the charge of an atom with 6 protons and 8 electrons?

Which statement is true about isotopes?

• Isotopes have the same number of protons but different numbers of neutrons.

• Isotopes have the same number of protons and neutrons.

• Isotopes have the same number of electrons but different numbers of protons.

• Isotopes have the same number of electrons as the element they are isotopes of.

How many electrons can the first energy level hold?

• 2

• 6

• 8

• 10

Which subatomic particle is responsible for chemical bonding?

• Proton

• Electron

• Neutron

• Nucleus

What is the atomic mass of an atom?

• The sum of the number of protons and electrons in the atom

• The number of neutrons in the atom

• The average mass of all the isotopes of the element

• The number of valence electrons in the atom

Which statement is true about ions?

• Ions are atoms that have gained or lost protons.

• Ions are atoms that have gained or lost neutrons.

• Ions are atoms that have gained or lost electrons.

• Ions are atoms that have gained or lost energy levels.

How do atoms become ions?

• By gaining or losing protons

• By gaining or losing neutrons

• By gaining or losing electrons

• By gaining or losing energy levels

What is the charge of an ion with 9 protons and 10 electrons?