Problem: If gallium, atomic number 31, combines with selenium, atomic number 34, what is the most likely formula based on your knowledge of the periodic nature of the elements? a) GaSe b) GaSe2 c) Ga2Se d) Ga2Se3

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If gallium, atomic number 31, combines with selenium, atomic number 34, what is the most likely formula based on your knowledge of the periodic nature of the elements?

a) GaSe

b) GaSe2

c) Ga2Se

d) Ga2Se3

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