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atoms and periodic table

Across
Verticle column
Electron in outer most shell
Subatomic particle with a negative charge
Subatomic particle that has a positive charge
An atom that has lost or gained an electron
The description of how an atoms electrons orbit its nucleus
Total number of protons and neutrons
Electron has more energy than it does at its ground state
Neutral subatomic particle
Down
Where protons and neutrons are located
Ability of an atom in a chemical compound to attract electrons
The unit used to express the mass
Number of protons
State where electron has the lowest energy level
Atoms of the same element with different number of neutrons
Horizontal row
Smallest unit