Compared to the stable reference element, an isotope is different in what way?
question 1 options:
a) more protons in the nucleus
b) fever electrons in the orbitals
c) more electrons in the orbitals
d) fewer neutrons in the nucleus
e) more neutrons in the nucleus

E) More neutrons in the nucleus

Explanation:

Isotope -

The atoms which have same number of protons but different number of neutrons.

And since , atomic number = protons number

and , mass number = proton + neutrons .

Hence ,

The atomic number will not change , but the mass number will change .

Hence , the correct option is more neutrons in the nucleus .