Question

Most of the known elements have fractional atomic masses. For example, the atomic mass of chlorine is 35.5 u. Such elements exist in different forms known as isotopes. These are regarded as the atoms of the same element having same atomic number (Z) but different mass numbers (A).

Why do isotopes of an element differ in their mass numbers?

Do the isotopes of an element show show chemical characteristics?

Do isobars belong to the same element?

If not, what is the reason behind?​

Answer 1

Answer:

mass have in small molecules called autom molecules have in all substances

Answer 2

Answer:

Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2). Isotopes of a given element contain different numbers of neutrons, therefore, different isotopes have different mass numbers.