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Atoms

Across
Smallest unit of an element
Neutral particle in an atom. Found in the nucleus.
Negatively charged particle in an atom. Found outside the nucleus.
Atoms with the same number of protons but different neutrons.
Down
Positively charged particle in an atom. Found in the nucleus.
An atom that has more or fewer electrons than protons.
Central part of an atom
Substance that cannot be broken down into other substances.