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Science 2.7 Elements and the Periodic Table

Across
Russian inventor of the periodic table
Has the chemical symbol Ag
Has an atomic number of 8
A column of elements in the periodic table
One or two letters that represent an element
The number of protons an atom contains
Has the chemical symbol Au
One type of atom
Down
The average mass of a typical atom of that element
Has an atomic number of 20
A table of all of the elements
Has the atomic number of 13 and the chemical symbol Al
A row of elements across the periodic table
Rings of orbiting electrons