The basic unit of a chemical element. Basic building blocks of matter.

A group of atoms bonded together, representing the smallest unit that can take part in a chemical reaction.

A positively charged subatomic particle in the nucleus of an atom.

A subatomic particle in the nucleus of an atom that has no charge.

A subatomic particle that orbits the nucleus of an atom and has a negative charge.

The sum of the protons and neutrons

The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

A property that can be described or tested without causing a change to the substance. These properties describe how a substance looks and feels and be observed using the senses.

A characteristic that explains how a substance has the potential to be changed into another substance. Tells how an object will act in a specific situation.

The matter that goes into a chemical change.

The matter that comes out of a chemical change

Compounds formed through a chemical process, using natural materials and human activity or help

Any material that is formed only in nature and not artificially by humans

The amount of matter in an object

The amount of space that an object or substance occupies

Is the measure of mass per volume and can be calculated by dividing mass by volume.

One of the distinct forms of matter: solid, liquid, and gas

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