Respuesta :

smmwaite

Answer:

=21 neutrons

Explanation:

The atomic mass of an atom is the total sum of the contents of the nucleus (protons and neutrons).

Thus atomic mass = no. of neutrons + no. of protons

Number of protons= The atomic mass-number of protons

= 34 - 13= 21
That would be 21 neutrons(34-13=21).
Atom mass is the number of protons+number of neutrons.

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