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Please someone help WHATS the answer

Please someone help WHATS the answer
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3 votes
Please someone help WHATS the answer

Please someone help WHATS the answer-example-1
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User NiYanchun
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1 Answer

6 votes
the average atomic mass: 40.078 u
electron configuration is the long list underneath the name "calcium" on the element. it starts with 1s^2s^2
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User Tomas Vana
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