An element X has a mass number 4 and atomic number 2. Write the valency of this element? -Science

An element X has a mass number 4 and atomic number 2. Write the valency of this element? -Science
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1 Answer

Answer :

Mass number = 4 Atomic number = 2 X is Helium. It has 0 valency and it will not react with any other atom because it has its outer shell filled.
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