The mass number of a nucleus is
Detailed Explanation:
The mass number (A) of a nucleus is defined as the sum of protons and neutrons in the nucleus. It is a count (dimensionless integer), not the actual mass in kilograms or atomic mass units.
Option 2 incorrectly states "total mass" (which would have units); Option 3 is false—mass number is close to but not always more than atomic weight; Option 4 is absurd—mass number is always greater than atomic number (Z).
Therefore, Option 1 is the correct answer.
Question 6 of 8 Atomic Structure
Practice PYQ questions from this topic across all years
The nucleus of an atom consists of
Isotopes of an element differ in