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    Could someone please tell me what the correct answer is to this question, I believe it is only 1 and 2. But the website annoyingly does not give you the answers afterwards.Name:  991DEB0E-440E-45A7-861D-46331AD9D377.jpg.jpeg
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    Its only 1 and 2 I think
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    It is 1 and 2 as the last one is wrong....it is not atomic number...it is atomic mass
 
 
 
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