Question

Where would you locate the element with electronic configuration $2,8$ in the Modern Periodic Table?

• A. Group $2$
• B. Group $8$
• C. Group $10$
• D. Group $18$

Answer 1

The correct option is D

Group $18$

Exaplanation for correct option:

D. Group $18$

• Group 18 elements are known as inert gases or noble gases.
• All the elements (He, Ne, Ar, Kr, Xe, Rn) of group 18 have completely filled valence shells. Thus, they are chemically inert and they do not react with other elements that’s why they are known as inert gases.

Noble gas:

• Noble gases belong to Group-$18$.
• The stability of noble gases is very high.
• Noble gases exhibit stable electronic configuration due to the completely filled orbitals.
• They are fairly non-reactive gases.
• The general electronic configuration of Noble gas is${\mathrm{ns}}^2{\mathrm{np}}^6$.

Thus, the element with electronic configuration $2,8$ in the Modern Periodic Table is Neon having the atomic number 10 and an atomic symbol$\mathrm{Ne}$.

Explanation for incorrect options:

Since the element with electronic configuration $2,8$ belongs to Group-$18$. Thus the other options A,B and C stand incorrect.

Hence, the correct option is D i.e. Group-$18$.