IS A - Unit 2 Vocabulary Review - 1

A change of matter from one form to another without a change in chemical properties.

• Compound

• Chemical Change

• Mass Number

• Physical Change

The temperature and pressure at which a liquid changes to a gas.

• Atomic Number

• Mass Number

• Boiling Point

• Melting Point

An atom's central region, which is made up of protons and neutrons.

• Neutron

• Density

• Element

• Nucleus

A combination of two or more substances that are not chemically combined.

• Matter

• Neutron

• Mixture

• Orbital

A subatomic particle that has a negative charge.

• Electron

• Neutron

• Proton

• Element

The smallest unit of an element that maintains the properties of that element.

• Reactivity

• Neutron

• Atom

• Proton

An electron that is found in the outermost shell of an atom and that determines the atom's chemical properties.

• Chemical Change

• Physical Change

• Element

• Valence Electron

Anything that has mass and takes up space.

• Mixture

• Matter

• Isotope

• Nucleus

The sum of the numbers of protons and neutrons in the nucleus of an atom.

• Atomic Number

• Mass Number

• Melting Point

• Boiling Point

A group of atoms that are held together by chemical forces; the smallest unit of matter that can exist by itself and retain all of a substance's chemical properties.

• Molecule

• Compound

• Isotope

• Mixture