Chemistry

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1.
atom
2.
element
3.
proton
4.
neutron
5.
electron
6.
shell
7.
weight
8.
mass
9.
number
10.
atomic
11.
helium
12.
calcium
13.
hydrogen
14.
physical
15.
chemical
16.
change
17.
positive
18.
negative
19.
periodic
20.
table