Question

An element has Z = 7. What is the valency of the element? Also name the element.

Answer 1

atomic number = 7
electric configuration=2,5
valency= 3
name of the element=nitrogen

hope this helps !! ^_^

Answer 2

Answer:

The element with Z = 7 is nitrogen.

Explanation:

• The element with Z = 7 is nitrogen. Z is the atomic number or number of protons in an element.

• Atomic number Z = 7

• Electronic configuration = $1s^{2} 2s^{2} 2p^{3}$

• Nitrogen exhibits variable valency and they are -3, -2, -1, +1, +2, +3, +4, +5.  
• According to the number of valence electrons, the reactivity of nitrogen with the atoms or molecules of different elements varies. Octet Rule of atoms should be applied to determine the valence electrons.