Question

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

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

Answer 1

The correct option is C

Group 18

1. The given electronic configuration has 8 electrons in its outermost shell which is complete and it is the characteristic of group 18.
2. The element is Neon (Ne) with atomic number 10.
3. Elements belonging to group 18 have their outermost shell complete i.e. they have a stable electronic configuration.
4. They are known as inert gases.
5. Elements from Group 18 are

• Helium $\mathbf{\left(}\mathit{H}\mathit{e}\mathbf{\right)}$,
• Neon $\mathbf{\left(}\mathit{N}\mathit{e}\mathbf{\right)}$,
• Argon $\mathbf{\left(}\mathit{A}\mathit{r}\mathbf{\right)}$,
• Krypton$\mathbf{\left(}\mathit{K}\mathit{r}\mathbf{\right)}$,
• Xenon$\mathbf{\left(}\mathit{X}\mathit{e}\mathbf{\right)}$, and
• Radon$\mathbf{\left(}\mathit{R}\mathit{n}\mathbf{\right)}$.

6.They have zero valences. They do not tend to react.

The correct option is (C) Group 18, option (A), (B) and (D) are incorrect.