Question

mass number of elements from hydrogen (atomic number 1) till calcium (atomic number 20) .
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Please answer fast ,it's urgent.

Answer 1

hydrogen ..mass no. is 1
calcium ...mass no. is 40


I hope it is correct and will help u

Answer 2

h-1   he-4    li-6.9    be-9   b-10.8    c-12    n-14    o-16    f-19    ne-20.18 
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 
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