Answer:
zero
Therefore an element X has a mass number 4 and atomic number 2., the valency of this element will be zero.
X is helium
valency is 2 as it has 2 electrons
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Answers & Comments
Answer:
zero
Therefore an element X has a mass number 4 and atomic number 2., the valency of this element will be zero.
Verified answer
Answer:
X is helium
valency is 2 as it has 2 electrons