Question

which is the noble gas notation for chlorine?
○ ne 4s² 4p⁵
○ ne 3s² 3p⁵
○ ne 3s² 3p³
○ ne 3p² 3p⁵

Explanation:

Step1: Recall electron config of Cl

Chlorine (Cl) has atomic number 17. Neon (Ne) has atomic number 10, so noble gas notation starts with [Ne].

Step2: Determine remaining electrons

Electrons left: \( 17 - 10 = 7 \).

Step3: Fill orbitals

Electron configuration for remaining 7 electrons: \( 3s^2 3p^5 \) (3s holds 2, 3p holds 5, total \( 2 + 5 = 7 \)).
So noble gas notation for Cl is [Ne] \( 3s^2 3p^5 \).

Answer:

[Ne] \( 3s^2 3p^5 \)