30-10-2019
Chemistry

contestada

What is the atomic mass of an atom with 9 protons 11 neutrons and 9 electrons

Respuesta :

arindamvutla arindamvutla

30-10-2019

Answer:

20 amu.

Explanation:

Atomic mass = protons + neutrons

= 9 + 11

= 20 amu

The atomic number = number of protons in it= 9.

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