The correct answer for the question that is being presented above is this one: "-2, -1, 0, 1, 2." T<span>he possible values of ml for an electron in a d orbital are -2, -1, 0, 1, 2. </span>Since the allowed values for mℓ range from −ℓ to +ℓ, once you know the value for ℓ you know the values for mℓ."
Isotopes
Mass atom of Neon: 20.1797 amu
Mass atom X = mass isotope 1 . % + mass isotope 2.% +.....

The answer is 4.04605 X 10^-25