Question

how to calculate atomic weight when no of proton and no of neutrons are given

Answer 1

Hello,

Here's the answer :-

We know that :-

Atomic no. = No. of protons = No. of electrons.

Mass no. = No. of protons + No. of electrons.

We can find only these two from the given data but for atomic weight,it is better to refer from a book.

This is the reason :-

Let's say hydrogen :-

Atomic number = 1

Electronic configuration = 1

Valence = 1

Atomic Mass = 1 amu

But,

Atomic weight = 1.008 amu


Thus, we can say that as it has an approximate value, it is better to refer from a book.

Hope it helped :-)