Question

element arrangement quick check
why is it impossible for an element to have an atomic number of 110.5? (1 point)
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 with atomic numbers greater than 100 are unstable.
atoms of an element all have the same whole number of protons and neutrons.

Explanation:

The atomic number represents the number of protons in an atom's nucleus. Protons are discrete particles, so their count must be a whole number.

Answer:

The atomic number is the number of protons, which is always a whole number.