Question

How can one find atomic mass without knowing no. of neutron ?​

Answer 1

Answer:

If we round off the atomic mass to the nearest whole number and subtract the atomic number from it, we get the number of neutrons. That is, number of neutrons = atomic mass (rounded to nearest whole number) - atomic number.

Explanation:

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Answer 2

Answer:

You find the atomic mass (AM) of an element by adding the neutrons (N) and the protons (P).

AM = P + N

If you are looking for the neutrons you can instead subtract the protons from the atomic mass:

N = AM - P

In the periodic table you will find the protons by looking at the atomic number at the top and the atomic mass will be found on the bottom.

Let’s say you are using Nitrogen, the atomic number is 7 therefore there are 7 protons. The atomic mass is 14

N = 14 - 7

N = 7 therefore there are 7 neutrons.