Chemistry S & P Block Elements SZABMU 2024
PMDC Verified Question 12 of 104
Which of the following element is s-block element?
A
Sulphur
B
Potassium
C
Iron
D
Neon
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Potassium
Concept:

The periodic table is divided into blocks (s, p, d, f) based on which subshell the last (valence) electron of an element enters.

Solution:

  • S-block elements comprise Group 1 (Alkali metals) and Group 2 (Alkaline earth metals).
  • Let's locate the options:
  • Sulphur (Group 16) is a p-block element.
  • Iron (Group 8) is a transition metal, making it a d-block element.
  • Neon (Group 18) is a noble gas, making it a p-block element.
  • Potassium (K) is in Group 1. Its final electron enters the 4s orbital (\( 4s^1 \)). Therefore, it is the only s-block element on the list.


Why other options are incorrect:

  • Sulphur, Iron, and Neon have their outermost electrons situated in p, d, and p orbitals respectively.

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