Question

which of the following elements has the mass spectrum represented above?
(a) nb
(b) mo
(c) u

Explanation:

Molybdenum (Mo) has isotopes with masses around 92, 94, 95, 96, 97, 98, 100 amu, matching the mass spectrum. Niobium (Nb) has fewer isotopes, and Uranium (U) has higher mass isotopes (e.g., 235, 238), not in this range.

Answer:

B. Mo