Two different neutral isotopes of the same element will have the same atomic number.
In chemistry, isotopes are atoms of the same element with the same atomic another but a different mass number.
The mass number of an element is the sum of the protons and neutrons in the nucleus of the element.
In other words, isotopes of the same elements will have the same atomic number but a different number of protons and or neutrons in their nuclei.
For example, hydrogen is an element with an atomic number of 1. There are 2 isotopes of hydrogen. The first one is deuterium and the second one is tritium.
Hydrogen lacks neutron. However, deuterium has one neutron while tritium has 2 neutrons. The 3 isotopes have the same atomic number.
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