The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
Classification of Elements & Periodicity · Class 11 · JEE Main Previous Year Question
The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
- a
15, 6 and 2
- b
16, 6 and 3
- c
16, 5 and 2
- d✓
15, 5 and 3
15, 5 and 3
🧠 is Phosphorus — p-block, Group 15 Phosphorus: . Valence electrons . Group .
🗺️ Find valency Valency = electrons needed to complete the octet .
So: Group 15, valence electrons 5, valency 3.
"Note: Phosphorus can also exhibit valency of 5 by utilising empty 3d orbitals, but its common/principal valency is 3"
Variable Valency: Unlike s-block elements, many p-block elements exhibit variable valencies due to the involvement of d-orbitals and, for heavier elements, the Inert Pair Effect. p-block elements can sometimes exceed a valency of 4 by using empty d-orbitals (for elements in period 3 and below), allowing them to form 5 or 6 bonds (e.g., , )
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