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Biology Vocab

Across
A chemical substance composed of atoms of two or more distinct elements chemically bonded to one another
Containing two atoms
The number of protons in the nucleus at the atom (The number always equals the number of electrons around the nucleus)
The positively charged center of an atom which contains both the protons and neutrons of the atom.
The smallest unit of an element that still retains the chemical properties of an element
Two or more substances mixed together, but not chemically bonded.
Down
The mass of an element; approximately equal to number of protons and neutrons in its nucleus
A subatomic particle, fundamental to all matter existing in the nucleus, with a positive charge and about equal in mass to a neutron.
A subatomic particle, fundamental to all matter except hydrogen, existing in the nucleus, with about the same mass as a proton, but carries no charge.
A subatomic particle, fundamental to all matter, existing in orbit around the nucleus of an atom and carries a negative charge.
A unit of matter representing the chemical properties of a substance composed of two or more atoms held together by chemical bonds
Anything with occupies space.