Question

How to find atomic masses of elements

Answer 1

SUM OF PROTONS AND NEUTRONS FOR A SINGLE ATOM

To calculate the atomic mass of a single atom  of an element, add up the mass of protons n neutrons.

Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons

The atomic mass of the atom is the mass of the protons plus the mass of the neutrons, 6 + 7, or 13.

Answer 2

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Atomic mass

Atomic mass in an atom or group of an atom is the sum of the masses of protons, neutrons and electrons.

Atomic Mass = No. of protons + No. of neutrons