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Needed Answer Before Friday Thank You Beri Much class=

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Answer:

Symbol - Mass no. - no. of. _ no. of

protons. neutron

Chlorine - Cl - 35.453 u - 17 - 18

Copper - Cu - 63.546 u - 29 - 36

Sodium - Na - 22.989769 u - 11 - 12

Explanation:

correct me if I'm wrong

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