Question

20. A metal Man oxide having the formula
M.O. It belongs to 3rd period of modem
periodic table. Write the atomic number and!
the valency of the metal.
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Answer 1

I think the only possible answer to this question is MgO

it belongs to 3rd period and 2 group of the periodic table

it's atomic no is 12 and it's valency is 2

I hope this helps