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

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Solution

Given atomic number = 2
Element = Helium (He)
Electronic configuration = 2 means it has only one shell which is a K shell filled with 2 electrons and a complete duplet.
Hence its valency = zero
Therefore an element X has a mass number 4 and atomic number 2., the valency of this element will be zero.

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

Given atomic number = 2Element = Helium (He)Electronic configuration = 2 means it has only one shell which is a K shell filled with 2 electrons and a complete duplet.Hence its valency = zeroTherefore an element X has a mass number 4 and atomic number 2., the valency of this element will be zero.