Question

how to find atomic mass ????​

Answer 1

Hey there ....

If the number of protons and neutrons is given then

Atomic Mass = Protons + Neutrons

Or Atomic Number + Neutrons .

And for general knowledge you can learn atleast atomic mass up to 20 elements ...

Hope it helps ....

Answer 2

Add the number of protons and neutrons to get the atomic mass because protons and neutrons are present in the nucleus of an atom which give the mass of an atom.
Atomic mass=protons +neutrons
Eg: In oxygen

Protons=8

Neutrons=8

Therefore atomic mass = 8+8=16
Always the number of protons and electrons will be the same before they form their ionic state. So always take the number of protons.