Why is it impossible for an element to have an atomic number of 110.5? (1 point)

Question

Atoms with atomic numbers greater than 100 are unstable.
The atomic number is the number of protons, which is always a whole number.
Exactly half of the isotopes would need an atomic number of 110, and half would need an
atomic number of 111, which is very unlikely.
Atoms of an element all have the same whole number of protons and neutrons.

Answer 1

The correct reason why it is impossible for an element to have an atomic number of 110.5 is: The atomic number is the number of protons, which is always a whole number.

Atomic numbers represent the number of protons in an atom's nucleus, and since protons are discrete particles, the atomic number must be a whole number. Therefore, an atomic number of 110.5 is not feasible.