Respuesta :

1frogaroni

Answer:

A.

Explanation:

50 protons,50 electrons, 75 neutrons.

Hope this helped!

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The number of protons and electrons is the same as the atomic number. Therefore, there are 50 protons and 50 electrons. To calculate neutrons you take the atomic number (50) and subtract it from the mass number (125)
125-50=75


50 protons
50 electrons
75 neutrons