Question

what is atom atomic mass no ​

Answer 1

Answer:

The mass number (symbol A, from the German word Atomgewicht (atomic weight)), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. ... The mass number is different for each different isotope of a chemical element.

Explanation:

plz mark me as brainlist!

Answer 2

Answer:

HI HELLO:-

the mass number is the sum of the number of protons and neutrons in an atom. It is a whole number. The atomic mass is the average number of protons and neutrons for all natural isotopes of an element . It is a decimal number