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Atoms

Across
Shells containing electrons that surround the nucleus of an atom.
Used for measuring large quantities of small entities such as atoms. Standard unit for amount.
Standard measure for mass.
A particle representing a quantum for light or electromagnetic radiation.
A particle in an atom with no charge.
A negatively charged particle in an atom.
Number of protons in an atom.
Down
A positively charged particle in an atom.
Positively charged ion.
Number of protons plus number of neutrons in an atom.
Electrons in the outer shell of an atom that determine how reactive an element is.
Atoms of the same element with a different number of neutrons.
The center of an atom, containing protons and neutrons.
A negatively charged ion.