Atomic Structure, Isotopes, and Ions

What is the atomic number of an atom?

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

Which subatomic particle has a positive charge?

• neutron

• electron

• proton

• photon

What is the mass number of an atom?

• Total number of electrons

• Total number of protons

• Total number of protons and neutrons

• Total number of neutrons

What are isotopes?

• Different forms of a particular chemical element which differ in proton number

• Different forms of a particular chemical element which differ in electron number

• Different forms of a particular chemical element which differ in atomic mass

• Variants of a particular chemical element which differ in neutron number

Which of the following is an isotope of carbon?

• carbon-12

• carbon-16

• carbon-18

• carbon-14

What is an ion?

• An ion is a type of chemical bond that forms between two atoms.

• An ion is a type of subatomic particle that is smaller than an atom.

• An ion is an atom or molecule that has a net electrical charge due to the loss or gain of electrons.

• An ion is a type of gas that is commonly found in outer space.

Which of the following ions has a positive charge?

• Neutrons

• Anions

• Protons

• Cations

What is the charge of an anion?

• Negative

• Neutral

• Positive

• Zero

How are ions formed?

• Atoms gain or lose electrons

• Ions are formed by the splitting of molecules

• Ions are formed by the fusion of atoms

• Ions are formed by the combination of protons and neutrons

Which of the following is an example of a cation?

• carbon atom (C)

• water molecule (H2O)

• chloride ion (Cl-)

• sodium ion (Na+)