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Vocab Hw

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