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04-12-2020
Chemistry

contestada

what is the mass number of a atom that has 4 protons 4electrons 5neutrons

Respuesta :

Bubblegumqueen212 Bubblegumqueen212

11-12-2020

Answer:

Please make sure to re-write this on your own so your teacher doesn't think that your cheating!

Explanation:

A neutral atom will have the same number of electrons does protons. Since it has 4 protons, it must have an atomic number of 4. (That will make it beryllium.) Since it has 4 protons and 5 neutrons, it has a mass number of 9.

So the answer is 9

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