name the 30 elements with their mass and atomic number and with there valency. only briliantist can anser.
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name the 30 elements with their mass and atomic number and with there valency. only briliantist can anser.
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Answer:
Explanation:
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BY Tolety Roshan
Answer:
Thank you too!!!!!!!!!!!!!!!
Explanation:
Hydrogen - 1, 1
Helium - 2, 0