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Atoms and Elements

1
2
3
4
5
6
7
8
9
10
11
12
13
14
Across
2
Occurs when an unstable atomic nucleus changes
5
Electrons move in a circular orbit around the nucleus
7
Electrons in the outer shell of atom
10
Chart of the elements arranged into rows and columns
11
Positively charged atomic particle
13
Atoms of the same element that have different # of neutrons
14
Negatively charged particle
Down
1
Small area in the center of the atom
3
An area around an atomic nucleus
4
Number of protons in an element
6
Combined atoms
8
Number of protons plus number of neutrons
9
Neutrally charged atomic particle
12
The smallest unit of matter