Explain more on isotope

Because they have the same number of protons, isotopes of an element have the same atomic number and occupy the same position on the periodic table. However, the different number of neutrons means they have different mass numbers.

For example, Carbon-12 (¹²C) and Carbon-14 (¹⁴C) are isotopes of carbon. Both have 6 protons. Carbon-12 has 6 neutrons (mass number 12), while Carbon-14 has 8 neutrons (mass number 14). This difference in neutron number affects their atomic mass and, in the case of ¹⁴C, its radioactivity.