Question

question 15
the number of valence electrons in an element with electron configuration 1s²2s²2p⁶3s²3p⁴ is
a 2
b 4
c 6
d 8

Explanation:

Step1: Identify valence - shell electrons

Valence electrons are in the outermost shell. Here, the outermost shell is the 3rd shell with electrons in $3s$ and $3p$ orbitals.

Step2: Count valence electrons

The number of electrons in $3s^2$ is 2 and in $3p^4$ is 4. So, the total number of valence electrons is $2 + 4=6$.

Answer:

C. 6