mass number of elements from hydrogen (atomic number 1) till calcium (atomic number 20) .
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Please answer fast ,it's urgent.
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mass number of elements from hydrogen (atomic number 1) till calcium (atomic number 20) .
....
Please answer fast ,it's urgent.
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calcium ...mass no. is 40
I hope it is correct and will help u
na-22.99 mg-24.31 al-26.98 p-30.9 s-32.07 cl-35,5 ar-39.9
k-39.10 ca-40
plzz mark brainlist