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chemistry crossword

Across
Electrons
Total number of protons and neutrons in an atom
Subatomic particles with no charge
Defined as one twelfth of the mass of a carbon 12 atom
Tiny central core of an atom
Number of protons in the nucleus
Weighted average of the atom in a naturally occurring sample
Down
Electrons travel from the cathode to the anode
Atoms with the same number of protons but different number of neutrons
An element composed of only one kind of atom, and a compound is composed of particle that are chemical combinations
Tiniest particle of life
Negatively charged subatomic particles
Positively charged subatomic particles