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Atomic Structure

Sarah Spalding

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1.Horizontal row in a periodic table.
3._____'s Atomic theory improved on the theory of the philosopher Democritus.
6.Negatively charged particles.
8.Vertical columns in the periodic table.
9.Once believed to be the smallest particle of matter.
10._____ ray is a glowing beam created by J.J Thompson.
11.Positively charges particles.
12.Atomic ______ the weighted average mass of the atoms in a natural sample.
14.Arrangement of elements separated into groups.
2.Atoms with the same number of protons, but different numbers of neutrons.
4.______ Number is the number of protons in the nucleus of an atom.
5.Neutral Particles.
7.Tiny central core of an atom.
13.an abbreviation of the 12th mass of a carbon-12 atom.

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