Question

what does the mass number of an atom represent​

Answer 1

Answer:

Explanation:

number of protons + number of neutrons

Answer 2

Answer:

The mass number of an atom represents the sum of number of neutrons and electrons/protons present in that atom (no. of electrons = no. of protons = atomic number).

Example: Mass of oxygen (O) is 16 and its atomic number is 8.  Hence it has 8 electrons, 8 protons and 16-8 = 8 neutrons.

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