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OpenStudy (alante):
Medal for answer An atom of element 21 has one more proton than an atom of element 2.
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OpenStudy (alante):
@SyedMohammed98 @airjordan200 @K12awesomeness
OpenStudy (k12awesomeness):
I'm sorry, I don't know this:(
OpenStudy (cuanchi):
element 2 or element 21?
OpenStudy (unklerhaukus):
the element number is equal to the number of protons in that element
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