izotópnál
Izotópnál is a term that appears to be a misspelling or a non-standard term. Based on the likely intended meaning, it probably refers to isotopes or a related concept within chemistry or physics. Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons in each atom. Since the number of protons determines the chemical element, all isotopes of an element fall into that same element category. For example, hydrogen is element number 1, meaning it has one proton. The most common isotope of hydrogen, protium, has one proton and no neutrons. Deuterium has one proton and one neutron. Tritium has one proton and two neutrons.
The difference in neutron number leads to variations in atomic mass. While most isotopes of an element