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ATOM REVIEW

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Across
1
Number of protons
3
A negatively charged subatomic particle
5
A subatomic particle found in the nucleus which has no charge
6
A charged atom due to a gain or loss of electrons
7
Electron in the outermost energy orbital (shell) of an atom.
12
Proton, neutron or electron
14
Number of protons plus the number of neutrons
15
A positively charged subatomic particle found in the nucleus
Down
2
Radon-222, for example
4
Different form of the same element, have different number of neutrons
8
Electron dot structure which shows valence electrons
9
Average of the isotopes of an element; usually a number with a decimal
10
An ion which has accepted electrons and becomes negatively charged.
11
A positively charged ion due to loss of electrons
13
Demonstrates the distribution of all electrons in their energy orbitals (shells)