Chapter 7 - Understanding the Atom

Smallest piece of an element that still represents the element.

• atom

• electron

• neutron

• proton

Atomic particle with one negative charge (1-)

• electron

• proton

• neutron

• atom

Area around an atomic nucleus where an electron is most likely to be found.

• electron cloud

• isotope

• ion

• nuclear decay

Neutral particle in the nucleus of an atom.

• neutron

• electron

• proton

• nucleus

Small area in the center of an atom in which most of an atom's mass and positive charge is concentrated.

• nucleus

• proton

• neutron

• electron

Atomic particle with one positive charge (1+)

• proton

• neutron

• electron

• nucleus

The number of protons in an atom of an element.

• atomic number

• atomic mass

• mass number

• isotope

Atom that is no longer neutral because it has gained or lost electrons.

• ion

• isotope

• proton

• radioactive

Any of two or more atoms of the same element that have different numbers of neutrons.

• isotope

• ion

• nucleus

• electron cloud

Sum of the number of protons and neutrons in an atom.

• mass number

• atomic number

• atomic mass

• isotope