Answers

2016-01-26T13:29:21+05:30
H is he symbol ,1 is the valency
1.008 is average atomic mas
1.00784 u ± 0.00001 u

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2016-01-26T13:29:23+05:30
Atomic mass of hydrogen = 1 u

It has 1 electron and proton and has 0 neutron.
1 5 1