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Answer Key
Grade 8 Science: Atoms, Molecules & Periodic Trends Awareness
1.
atom
2.
positive
3.
negative
4.
no/neutral/zero
5.
protons
6.
group/family
7.
molecule
8.
molecule/compound
9.
protons, neutrons, and electrons
10.
an element has one type of atom; a compound has two or more elements chemically bonded
11.
the number of protons in the nucleus of an atom of that element
12.
they have the same number of valence electrons in their outer shell
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