Question

Which of the following elements has the maximum number of Valence Electrons ?

• A. Na
• B. Al
• C. Si
• D. P

Answer 1

The correct option is D

P

An explanation for the correct option.

1. A systematic representation of how electrons are arranged in an atomic orbital is called an electronic configuration.
2. The atomic number of Phosphorus$\left(P\right)$ is $15.$
3. Electronic configuration would be ${}_{15}P=2,8,5$
4. The outermost shell has 5 valance electrons.

An explanation for the incorrect option:

1. Electronic configuration of Sodium $\left(Na\right)$ would be ${}_{11}Na=2,8,1$, Outermost shell consist of 1 electron , so option (A) is incorrect.
2. The electronic configuration of Aluminum $\left(Al\right)$ would be ${}_{13}Al=2,8,3$, Outermost shell consists of 3 electrons, so option (B) is incorrect.
3. Electronic configuration Silicon $\left(Si\right)$ would be ${}_{14}Si=2,8,4,$ Outermost shell consist of 4 electrons , so option (C) is incorrect.

Hence, The correct option is (D) Phosphorus $\mathbf{\left(}\mathit{P}\mathbf{\right)}$