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Please help I'm not sure what the answers are​
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Please help I'm not sure what the answers are​

Please help I'm not sure what the answers are​-example-1
User David Spenard
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Answer:

An element's mass number (A) is the sum of the number of protons and the number of neutrons. The small contribution of mass from electrons is disregarded in calculating the mass number.

User Chikako
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