Chemistry
Give reasons for the following.
Mass number is slightly less than the actual atomic mass.
Answer
The mass number is a whole number approximation of the atomic mass in atomic mass units since the mass of the proton as well as the mass of the neutron is approximately equal to 1 a.m.u. and the mass of the electron is negligible. Hence, the mass number is slightly less than the actual atomic mass.
Related Questions
Differentiate between the following terms.
Electron and proton
Give reasons for the following.
The shells surrounding the nucleus of an atom are also called 'energy levels'.
Differentiate between the following terms.
Atomic number and mass number
Give reasons for the following.
Helium is chemically extremely unreactive.