SSC MTS EXAM

Detailed explanation-1: -The total number of protons and neutrons in an atom is called its mass number (A). The number of neutrons is therefore the difference between the mass number and the atomic number: A – Z = number of neutrons.

Detailed explanation-2: -Atomic mass and atomic mass unit Each element in the periodic table consists of atoms, and each atom has a unique atomic mass and unique atomic number. The atomic number refers to the number of protons in the atom’s nucleus, while atomic mass reflects the sum of the number of protons and neutrons.

Detailed explanation-3: -The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.