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A, the mass number, is equal to...

A. neutrons + electrons

B. protons + neutrons

C. protons + electrons

D. protons

A the mass number is equal to A neutrons electrons B protons neutrons C protons electrons D protons class=

Respuesta :

kambriapivovaroff

Answer:

B.

Explanation:

KKDuggy
B

The mass number is how many protons and neutrons are in an atom’s nucleus

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