Select the correct observation:
A. Na has a bigger atomic radius than Li due to decrease in nuclear charge
B. F has a smaller atomic radius than Li due to increase in nuclear charge
C. Na and Cl belong to the third period of Modern Periodic Table and have identical electronic configuration.
D. Elements of Group 17 have the biggest atomic size in their respective periods.
Answer:B
Select the correct observation:
A. Na has a bigger atomic radius than Li due to decrease in nuclear charge B. F has a smaller atomic radius than Li due to increase in nuclear charge C. Na and Cl belong to the third period of Modern Periodic Table and have identical electronic configuration. D. Elements of Group 17 have the biggest atomic size in their respective periods.
Explanation: Both F and Li lie in the second period as they have two occupied shells. However, as the effective nuclear charge is more in the case of F as compared to Li, F has a smaller atomic radius than Li.