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Chemistry Question on Periodic properties

The electron affinity values are negative for:
A. Be -> Be−
B. N -> N−
C. O -> O2−
D. Na -> Na−
E. Al -> Al−
Choose the most appropriate answer from the options given below:

A

D and E only

B

A, B, D and E only

C

A and D only

D

A, B and C only

Answer

D and E only

Explanation

Solution

The electron affinity values for each case are determined as follows:
(A) Be + e−^- →\to Be−^-: Electron affinity is negative (E.A. = --ive).
(B) N + e−^- →\to N−^-: Electron affinity is negative (E.A. = --ive).
(C) O + e−^- →\to O−^-: Electron affinity is positive for O →\to O−^- (E.A. = +ive).
(D) Na + e−^- →\to Na−^-: Electron affinity is positive (E.A. = +ive).
(E) Al + e−^- →\to Al−^-: Electron affinity is positive (E.A. = +ive).
Thus, the correct answer is: A, B, and C only.