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Istopes: Atoms of the same element that have the same number of protons but a different amount of neutrons.

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Why is it extremely difficult to separate the two isotopes of copper 63Cu and 65Cu?

The separation of isotopes is relatively easy for light elements as hydrogen, lithium, nitrogen etc. For elements with higher atomic weight and a small difference between the atomic masses of the isotopes the process is long and expensive. The insignificant differences between these isotopes doesn't facilitate the separation.


Each of the three known isotopes of hydrogen has what protons in the nucleus?

Each isotope of hydrogen has 1 proton in the nucleus. The difference between the isotopes lies in the number of neutrons: hydrogen-1 has 0 neutrons, hydrogen-2 (deuterium) has 1 neutron, and hydrogen-3 (tritium) has 2 neutrons.


Do Isotopes of uranium have different atomic numbers?

No. By definition isotopes of an element have the same number of protons (that is what makes them uranium, for example) but different numbers of neutrons (neutral particules in the nucleus which provide mass).


The various atomic weights of the same element are called?

Atoms of the same element with different atomic masses are known as isotopes. Isotopes differ only by the number of neutrons present in the nucleus of the isotopes. The number of protons is the same for all isotopes of an element (because if there were different numbers of protons, then the atoms would not be of the same element).


Which best describes the definition for the atomic mass of the element?

it is the weighted average of the masses of an element's isotopes.