An isotope contains 26 protons, 24 electrons, and 32 neutrons
what is the identity of the isotope?

58 fe 2-
58 ge 2-
58 fe 2+
58 ge 2+

The correct option is 58 Fe 2+.
A neutral atom normally has the same number of proton, neutron and electrons, if the number of electrons differ from that of proton, that means that the elements has given some electrons away or it has gained some electrons from another element.
In the question given above, the atomic number of the element is 26 [because the proton number is 26], which means the element is iron. Iron has 24 electrons because it has given two away, so it will have +2. The iron has 32 neutrons instead of 26 so it is an isotope.

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.