Question

define following 1. atomic mass unit 2. Istopes​

Answer 1

Explanation:

1. atomic mass

Atomic mass, the quantity of matter contained in an atom of an element. It is the sum of no of protons and no of neutrons

2) Isotopes:-

Same elements with same atomic number , but different mass number is called isotopes

like in Hydrogen : Protium, Deuterium,Tritium

Answer 2

Answer:

Atomic unit mass: A unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to ¹/₁₂ the mass of a single atom of the most abundant carbon isotope 12C.

Isotopes: They are defined as the atoms of the same element, having the same atomic number but different mass numbers.