Chemistry

The smallest particle of an element is:

• Mole

• Ion

• Atom

• Electron

Atomic number is...

• The number of protons

• The number of electrons

• The number of ion

• The number of neutron

A substance made of two or more elements

• Atom

• Mole

• Avogadro's number

• Compound

A negatively charged particle in an atom

• Proton

• Neutron

• Ion

• Electron

A substance made up of only one kind of atom

• Element

• Compound

• Molecule

• Nucleus

Columns on the periodic table of elements

• Lines

• Columns

• Groups

• Periods

A subatomic particle that has no electric charge

• Proton

• Neutron

• Electron

• Nucleus

The center of an atom

• Nucleus

• Ion

• Orbital

• Isotope