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Atomic Structure Vocabulary

Across
The sum of the numbers of protons and neutrons that make up the nucleus of an atom.
An atom that has a negative charge.
An atom that has a positive charge.
A particle much smaller than an atom.
An atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons.
1/12 the mass of a single carbon-12 atom.
The tiny, dense central portion of an atom.
An atom that has gained or lost one or more electrons and has a positive or negative charge.
Down
The electrons in the outer shell of an atom. These are the electrons that are used during bonding.
Electrons in the inner shells. These electrons are not involved in bonding.
The mass of an atomic particle, subatomic particle, or molecule.
The number of protons in the nucleus of one atom of an element.
The negatively charged subatomic particle. Found outside the nucleus.
The smallest particle of an element that retains its identity in a chemical reaction.
The subatomic particle with no charge. Found in the nucleus.
The positively charged subatomic particle. Found in the nucleus.