Answer:
The elements with the same atomic number but different mass are called isotopes.
Explanation:
Isotopes are atoms of the same element that differ in the number of neutrons in their nuclei. That is, isotopes are atoms that have the same atomic number - equal numbers of protons - but different atomic mass - different number of neutrons. Their chemical properties, however, do not differ.
Explanation:
<h3>Lithium is widely distributed but does not occur in nature in its free form. Because of its reactivity, it is always found bound with one or more other elements or compounds. ... The metal is separated from other elements in igneous rocks, and is also extracted from the water of mineral springs.</h3>