SSC MTS EXAM

Detailed explanation-1: -The number of protons in the nucleus of an atom of a given element is called the atomic number of that element. 2. Mass number of an atom is defined as the sum of number of protons and neutrons present in the nucleus of an atom.

Detailed explanation-2: -The atomic number is the number of protons in the atom’s nucleus and the number of electrons in the atom. The mass number is the total number of protons and neutrons in the atom’s nucleus.

Detailed explanation-3: -The number of protons in a nucleus is called the atomic number and always equals the number of electrons in orbit about that nucleus (in a nonionized atom). Thus, all atoms that have the same number of protons–the atomic number–are atoms of the same element.

Detailed explanation-4: -The number of protons in an atom is called its atomic number (Z). This number is very important because it is unique for atoms of a given element. All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.