Which of the following sets are isoelectronic (i. e., have the same number of electrons)? i. Br-, Kr, Sr2+ ii. C, N-, O2- iii. Mg2+, Ca2+, Sr2+ iv. O2-, O, O2+ v. Ag+, Cd2+, Pd

ii.

Explanation:

Isoelectric species are the species which have same number of electrons.

From the given options:-

are the isoelectric species.

All the three species have same number of electrons which is equal to 6.

Carbon has 6 electrons.

has 6 electrons.

has 6 electrons.

the answers would be

the first one and the second one