Chemistry S & P Block Elements PMC 2021
PMDC Verified Question 63 of 104
In periodic table, the period number tells the
A
Number of shell
B
Electronic configuration
C
Metallic character
D
Photon
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Number of shell
Concept:

The architecture of the periodic table is directly linked to the quantum mechanical model of the atom.

Solution:

  • The horizontal rows of the periodic table are called periods.
  • The period number (1 through 7) perfectly corresponds to the principal quantum number (\( n \)) of the outermost valence electron shell being filled.
  • For example, elements in Period 3 (Na, Mg, Al...) are filling their 3rd electron shell.
  • Therefore, the period number strictly dictates the total number of electron shells containing electrons in that atom.


Why other options are incorrect:

  • Group number gives information about valence electronic configuration and metallic character. Photon is completely unrelated to atomic positioning.

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