JEE Main 2019ChemistryClassification of Elements and Periodicity in PropertiesEasyMCQ

JEE Main 2019 — Classification of Elements and Periodicity in Properties Question with Solution

JEE Main 2019 (12 Apr Shift 1)

Question

The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:

Choose an option

Show full solutionCorrect option: D
Correct answer
D15,5 and 3

Step-by-step explanation

Atomic number 15 electronic configuration is
15→1s2,2s2,2p6,3s2,3p3
and this element is Phosphorous.
Group no =15
Valence e-⇒e- present in valence shell
=2+3=5
Valency =3 , it needs 3 electron to complete its octet.

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About this question

This is a previous-year question from JEE Main 2019, covering the Classification of Elements and Periodicity in Properties chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.