answer the following
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Explanation:
FIRST ONE IS HYDROGEN'S FIRST ISOTOPE PROTIUM.
UPPER NUMBER IN IT MEANS MASS NUMBER AND LOWER NUMBER MEANS ATOMIC NUMBER .
NEXT IS NEUTRON. LOWER NUMBER IS ITS CHARGE WHICH IS 0 SINCE NEUTRON IS NEUTRAL IN NATURE AND UPPER ONE IS ITS MASS ASSUMED TO BE TAKEN AS 1 UNIT OR 1 u.
THIRD ONE IS ELECTRON. LOWER NUMBER IS ITS CHARGE WHICH IS -1 AND UPPER NUMBER IS ITS MASS ASSUMED AS 0 BECAUSE MASS OF ELECTRON IS 9.1 X 10^-31 KG WHICH IS VERY NEGLIGIBLE AND IT IS CONSIDERED AS 0.
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