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An element has Z = 7. What is the valency of the element? Also name the element.
Z=7 (No. of protons = Z)
Therefore, Atomic number = 7
Number of electrons = 7
Electronic configuration is
K L
2 5
There are 5 electrons in the outermost orbit. So, in order to complete its octet, the atom will have to gain 3 electrons.
Therefore, the valency of the atom is 3.
The given element is nitrogen.
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