Question

The electronic configuration of an element is 2,8,7. What is the atomic number of the element?

• A. 10
• B. 11
• C. 17
• D. 19

Hint:

The atomic number of an element is equal to the total number of electrons in a neutral atom.

Answer 1

The Correct Option is C

The atomic number of an element is determined by the total number of electrons. Given the configuration \(2,8,7\), summing these gives: \[ 2 + 8 + 7 = 17 \] This corresponds to chlorine (\(\text{Cl}\)). Thus, the correct answer is \( \mathbf{(C) 17} \).