Final answer:
The superscript number for molybdenum-97 in atomic notation is 97, which represents its mass number.
Step-by-step explanation:
For an atom of molybdenum-97, the number you would put as the superscript in the atomic notation is 97. This number is known as the mass number and it represents the total number of protons and neutrons in the nucleus of the molybdenum atom. Molybdenum-97 would be represented as 97Mo, where Mo is the chemical symbol for molybdenum and 97 indicates the mass number. In atomic notation, the superscript represents the mass number of an atom. The mass number is the sum of the number of protons and neutrons in the atom's nucleus. For an atom of molybdenum-97, the number you would put as the superscript in the atomic notation is 97.