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cesar sanchez

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Across
3.Makes up 78% of the atmosphere
5.11
7.column of elements in the periodic table
8.C
13.LI
14.the number of protons
17.is a 1 or 2 -- letter internationally agreed code for a chemical element
18.The mass of an atom expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom...
19.F
20.These elements are all to the right of the stairstep
Down
1.a chart of elements
2.This element is used in making colorful signs
4.It's what we breath in
6.most of the elements in the periodic table
9.He
10.luster is the way a mineral reflects light
11.a row of elements in the periodic table
12.diffrerent type of metter
15.`1
16.properties of both metals and non metals

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