Question

Atoms have very small mass and so usually the mass of atoms are given relative to a standard called atomic mass unit. What is atomic mass unit

Answer 1

atoms have complex mass values for example considering Hydrogen it has mass 1.673*10^-27, memorising such values is difficult .so, scientists consider a small basic mass unit .Masses of all elements are integral multiples of that basic unit .That unit is known as atomic mass unit.It is obtained by taking 1/12 mass of C-12 isotope