Which element has the ground state electronic configuration of $ 1s^2 2s^2 2p^6, 3s^2, 3p^6 $? · S & P Block Elements MDCAT Past Paper MCQ

Chemistry S & P Block Elements UHS 2023

PMDC Verified Question 22 of 104

Which element has the ground state electronic configuration of $ 1s^2 2s^2 2p^6, 3s^2, 3p^6 $?

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Propolis Cognitive Error Autopsy

Official Correct Choice:

Option A: Ar

Concept:

An element's identity is defined by its atomic number, which in a neutral ground state atom is exactly equal to the total number of electrons.

Solution:

Count the total number of superscripts in the given electronic configuration to find the total number of electrons:

$$ 2 + 2 + 6 + 2 + 6 = 18 \text{ electrons} $$
A neutral atom with 18 electrons has an atomic number of 18.
Looking at the periodic table, atomic number 18 corresponds to the noble gas Argon (Ar).

Why other options are incorrect:

Cl: Has 17 electrons ($ 3p^5 $).
Na: Has 11 electrons ($ 3s^1 $).
S: Has 16 electrons ($ 3p^4 $).

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