garydesir1
garydesir1
07-08-2017
Chemistry
contestada
Can someone help me out please ? Thanks!
Respuesta :
brendan62
brendan62
07-08-2017
Potassium-39
- It has
19 protons
and atomic mass is
39
Calcium has
20 protons
fluorine has
9 protons
Aluminum has
13 protons
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