Study Guide Chemistry

The smallest particle of an element that retains its identity in a chemical reaction.

• atom

• proton

• neutron

• nucleus

Tags

NGSS.MS-PS1-5

The theory that states the following: all elements are composed of atoms, atoms of the same element are identical, atoms of different elements can combine chemically to form compounds, chemical reactions occur when atoms are separated from one another.

• Dalton's atomic theory

• cathode ray

• isotope

• mass number

Tags

NGSS.MS-PS1-5

Negatively charged subatomic particles.

• protons

• neutrons

• electrons

• isotope

A glowing beam that traveled from the cathode to the anode.

• cathode ray

• nucleus

• neutron

• electron

Tags

NGSS.HS-PS2-5

NGSS.HS-PS4-3

Positively charged subatomic particles

• protons

• neutrons

• electrons

• nucleus

Subatomic particles with no charge.

• protons

• neutrons

• electrons

• isotope

The tiny central core of an atom and is composed of protons and neutrons.

• isotope

• nucleus

• electron

• atomic number

The number of protons in the nucleus of an atom of that element.

• atomic number

• mass number

• atomic mass unit

• atomic mass

The total number of protons and neutrons in an element

• atomic mass

• mass number

• atomic mass unit

• atomic mass

Atoms that have the same number of protons but different numbers of neutrons.

• isotopes

• atomic number

• mass number

• atomic mass