Q1. Given below:
Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group
Reason (R): In a group, the atomic radii generally increase from top to bottom.
Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group
Reason (R): In a group, the atomic radii generally increase from top to bottom.
Explanation
Assertion (A) is false: Electron affinity generally decreases as you move down a group due to increasing atomic radii and weaker nuclear attraction for the incoming electron. Additional electron shells increase the shielding effect, further reducing effective nuclear pull. Reason (R) is true: As you go down a group, additional electron shells are added, making the atomic radius increase. This is because the outermost electrons are farther from the nucleus, and the shielding effect from inner electrons increases. Directions: The following Items consist of two statements. One labeled as the ‘Assertion (A)’ and the other as ’Reason (R)’. You have to answer these items using the code given below:(2003)