1
a substance formed when two or more chemical elements are chemically bonded together
2
the smallest of the particles that make up an atom, and they carry a negative charge
3
a substance consisting of atoms which all have the same number of protons
4
The central part of an atom that contains the protons and neutrons.
5
A particle found in the nucleus of an atom. It is almost identical in mass to a proton, but carries no electric charge.
6
a subatomic particle found in the nucleus of every atom. The particle has a positive electrical charge, equal and opposite to that of the electron
7
the basic units of matter and the defining structure of elements.
