Question

Which of the following element have the same chemical properties as an element having electronic configuration 2, 8, 5?

• A. Fluorine (9)
• B. Sodium (11)
• C. Nitrogen (7)
• D. Argon (18)

Answer 1

The correct option is C Nitrogen (7)

The electronic configuration and the number of valence electrons of the elements are given in the table below.$$\begin{array}{ccc}\text{Element}& \text{Electronic configuration}& \text{No. of valence electrons}\\ \text{Fluorine}& 2,7& 7\\ \text{Sodium}& 2,8,1& 1\\ \text{Nitrogen}& 2,5& 5\\ \text{Argon}& 2,8,8& 8\end{array}$$The elements having the same number of valence electrons have similar chemical properties. Since both nitrogen and the given element have five valence electrons, their chemical properties would be similar.