Subatomic particle with a negative charge

• proton

• electron

• neutron

• nucleus

Subatomic particle with no charge

• proton

• neutron

• electron

• nucleus

Subatomic particle with a positive charge

• proton

• neutron

• electron

• isotope

The smallest unit of matter that retains the identity of a substance

• atom

• isotope

• proton

• nucleus

molecular forces between particles within a substance that acts to unite them

• matter

• cohesion

• gravity

• isotope

Anything that has mass and takes up space

• atom

• element

• matter

• molecule

electrons located on the last shell or energy level of an atom

• isotopes

• valence electrons

• plasma

• element

The number of protons in the nucleus of an atom

• atomic mass

• atomic number

• isotope

• nucleus

equal to the number of protons plus neutrons in the nucleus of an atom

• atomic mass

• atomic number

• isotope

• valence electrons

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons

• isotope

• cohesion

• molecule

• compound