Question

Assertion: There is a small increase in the covalent radius from As to Bi.
Reason: As and Sb have completely filled d orbitals and Bi has completely filled d and f orbitals.​

Answer 1

Answer:

There is a considerable increase in covalent radius from N to P. However, from As to Bi only a small increase in covalent radius is observed. This is due to the presence of completely filled d and/or f orbitals in heavier members.

Explanation:

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Answer 2

Both Assertion and Reason are true and Reason is the correct explaination of Assertion

• Arsenic, Antimony and Bismuth belong to the group 15 of periodic table. All three are p-block elements.
• It is a general observation that the covalent radius increases down the group gradually from N to P in group 15.
• But in case of As, Sb, Bi there is only a small increase in the covalent radius due to the presence of completely filled d orbitals in As and Sb and completely filled d and f orbitals in Bi.