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Anything that has weight and takes up space. It is composed of elements.

The study of composition of substances and how they change.

Is the study of chemistry in living organisms.

Composed of chemically identical atoms.

Particle formed when two or more atoms of different elements chemically combine.

Required by the body in Large amounts.

Required by the body in Small amounts.

Required by the body in very minute amounts.

Smallest part of an element.

Form when atoms combine with other atoms.

Central portion of atom contains protons and neutrons. Has no weight.

Located circling around the nucleus. Carry a negative charge.

Located in the central portion of atom. Carry a positive charge.

Located in the center of an atom. Are electrically neutral.

The number of protons in the atoms of a particular element.

Number of protons plus the number of neutrons in each of an elements atoms.

Atoms that have the same atomic numbers but different atomic weights. Different neutrons. EX: Oxygen, Iodine, Iron.