Atomic Theory

The atomic number is the number of _____ in an atom.

• protons

• neutrons

• electrons

• quarks

are moving really really fast!

• protons

• neutrons

• electrons

• protons and neutrons

_____ are part of the nucleus.

• protons

• neutrons

• electrons

• protons and neutrons

determines what element the atom is

• protons

• neutrons

• electrons

• protons and neutrons

orbit the nucleus.

• protons

• neutrons

• electrons

• protons and neutrons

Isotopes are atoms of the same element with a different number of

• protons

• neutrons

• electrons

• protons and neutrons

The number of _____ determine which element the atom is. Atoms of the same element always have the same amount.

• protons

• neutrons

• electrons

• protons and neutrons

_____ have a positive charge.

• protons

• neutrons

• electrons

• protons and neutrons

_____ have a negative charge.

• protons

• neutrons

• electrons

• protons and neutrons

Ions are atoms that have lost or gained _____ and therefore have a charge.

• protons

• neutrons

• electrons

• protons and neutrons