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atoms and matter

Across
(2 words) The number that represents the protons and neutrons in an atom.
A substance that cannot be broken down into simpler substances by chemical means..
A particle with a negative charge that is in the electron cloud of an atom.
(2 words) The mass number of an atom is the total number of protons and neutrons it contains.
Down
Is a particle of matter that uniquely defines a chemical element.
(2 words) Is a notation of one or two letters representing a chemical element.
A particle with a neutral charge that is in the nucleus of an atom
A particle with a positive charge that is in the nucleus of an atom