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Vocab Hw

Find the words that best fits theses defintions 
                        Due on Feb 13 2018
1
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9
Across
2
An alkali metal that was discovered by Marguerite Perey
5
An arrangement of elements
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A species of atoms having the same number of protons in their nuclei
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The pencil element
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This element has an atomic number of 1
Down
1
A Russian chemist who created the periodic table
3
The bottom number of each element
4
Superman's planet
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The top number of each element