The sum of the total number of protons and neutrons present in the nucleus of an atom is known as-

Correct option is A

The correct answer is (a) Mass number.
· The mass number is defined as the sum of the total number of protons and neutrons present in the nucleus of an atom. It is represented by the symbol "A" and is crucial in determining the atomic mass of an element.
Information Booster:
Avogadro number:
· The Avogadro number, also known as Avogadro's constant, is the number of atoms, molecules, or ions in one mole of a substance. Its value is approximately 6.022 × 10²³ particles per mole.
Gauss number:
· There is no specific term known as "Gauss number" in chemistry or physics related to atomic structure. It might be confused with Gaussian units, which are used in the centimeter-gram-second (CGS) system for measuring magnetic fields.
Atomic number:
· The atomic number, represented by the symbol "Z," is the number of protons present in the nucleus of an atom. It uniquely identifies an element and determines its position in the periodic table.