Question

what is mass number

Answer 1

Mass Number: Together, the number of protons and the number of neutrons determine an element's mass number.

• Mass number = protons + neutrons.
• It is denoted by the letter A.
• It is also known as nucleon number or atomic mass number.
• It is used to organize the chart of nuclides.
• For example — An atom of carbon has 6 protons and 6 neutrons. thus, its mass number is 12.