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tatuchka [14]
4 years ago
5

Can someone help me out please ? Thanks!

Chemistry
1 answer:
sammy [17]4 years ago
3 0
Potassium-39<span> - It has </span>19 protons<span> and atomic mass is </span><span>39
</span>Calcium has  <span>20 protons
fluorine has </span><span>9 protons
Aluminum has </span><span>13 protons</span>
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