S2 Vocabulary

Release of a beta particle from the nucleus

Release of a gamma ray from the nucleus

Release of an alpha particle from the nucleus

Release of a neutron from the nucleus

the idea that matter is made up of fundamental particles called atoms

the concept that energy cannot be created or destroyed

the theory that all matter is composed of molecules

the belief that atoms are indivisible and indestructible

is anything that has mass and volume

is a substance that can be seen and touched

is a form of energy that can be converted

is a concept that describes the absence of matter

are the building blocks of matter

are the smallest unit of a compound

are made up of molecules

are found only in solids

The time it takes for a substance to double in quantity

The time it takes for half of an atom to decay

The time it takes for a substance to reach its boiling point

The time it takes for a substance to freeze

Depends on the amount of matter present

Does not depend on the amount of matter that is present

Varies with temperature and pressure

Is always equal to one

a measure of the amount of matter

a measure of the volume of an object

a measure of the weight of an object

a measure of the density of an object

The number of neutrons in an atom.

The number of protons in an atom. It tells you what element it is.

The total number of electrons in an atom.

The mass of an atom measured in atomic mass units.

Can be only observed by changing the composition/identity of the substance

Can be observed without altering the substance

Are the same as physical properties

Are always visible to the naked eye

neutral particle in the nucleus

negative particle in the nucleus

positive particle in the nucleus

particle found in the electron cloud