Nature of matter

Isotopes of an element contain

• equal numbers of protons and neutrons.

• the same number of protons but a different number of neutrons.

• the same number of neutrons but a different number of protons.

• the same number of protons but a different number of electrons.

Ionic bonds form when

• electrons are shared equally between two atoms.

• electrons are shared unequally between two atoms.

• electrons are transferred from one atom to another.

• slight attractions develop between oppositely charged regions of nearby molecules.

What two subatomic particles form the nucleus of an atom?

• protons and neutrons

• protons and electrons

• isotopes and neutrons

• isotopes and electrons

All atoms of the same element contain the same number of

• neutrons.

• protons.

• neutrons and electrons.

• neutrons and protons.

Radioactive isotopes are used for:

• determining the age of rocks and fossil

• treating cancer cells

• tracing the movements of molecules

• All of the above

What overall charge does the nucleus have?

• neutral

• positive

• negative

The atomic number describes the number of

• Protons

• Neutrons

• Electrons

in neutral atoms, the numbers of ---- are equal

• neutrons and protons.

• protons and electrons

• neutrons and electrons.

• protons and neutrons

Mass number is the number of ---

• neutrons and protons.

• protons and electrons

• neutrons and electrons.

• protons and neutrons

Isotopes atoms of the same element that differ in the number of --- they contain

• Protons

• Neutrons

• Electrons