Question

The nuclides I-131 and I-133 are classifieds as

A) isomers of the same element
B) isomers of Xe-131 and Cs-133
C) isotopes of the same element
D) isotopes of Xe-131 and Cs-133

Answer 1

Isotopes are two atoms with the same number of protons, but a different number of neutrons. Because they have the same number of proton they are atoms of the same element, but with different masses.
so, the answer is c.
i hope this will help you

Answer 2

C) isotopes of the same element

Step-by-step explanation:

An isomer is molecule with the same atoms as other but with a different distribution (position, optic, spacial, geometrical, etc).

This applies to molecules and not to atoms. (options A and B can't be)

The isotopes are two atoms of the same element (equal proton number) but with different mass number. This is the case of I-131 and I-133. SO option C is correct.

Also, I-131/Xe-131 and I-133/Cs-133 are two pairs of isobars (two atoms of different elements with the same mass number).