Question

mass number and atomic number?​

Answer 1

$\huge\underline{ \mathbb\red{❥A} \green{n}\mathbb\blue{S} \purple{w} \mathbb \orange{E}\pink{r}}\:$

The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.

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Answer 2

Explanation:

mass number is the number of protons and neutrons present in the nucleus.

The total number of protons present in the nucleus of an atom gives us the atomic number of that atom. It is denoted by 'z'

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