A change directly from the solid to the gaseous state without becoming liquid

• sublimation
• condensation
• deposition
• evaporation

The phase change from a liquid to a solid.

• freezing
• sublimation
• melting
• condensation

an isotope having an unstable nucleus that decomposes spontaneously by emission of nuclear radiation, thus achieving a stable nuclear composition.

• neutron
• atom
• ion
• radioactive isotope

The change of state from a gas to a liquid

• sublimation
• deposition
• evaporation
• condensation

Thermal energy that flows from a warmer material to a cooler material.

• freezing
• kinetic energy
• pressure
• heat

an average of the mass of all isotopes of an element

• atomic mass

• mass number

• atomic number

• half life

Mass per unit volume of a material.

• volume
• temperature
• mass
• density

A phase that has a definite volume but takes the shape of its container.

• gas
• liquid
• plasma
• solid

The smallest particle of an element that still retains the properties of the element.

• proton
• atom
• electron
• neutron

Amount of space occupied by an object.

• density
• mass
• pressure
• volume