Hydrogen
Hydrogen:
- First element in the periodic table
- Electronic configuration is 1s1.
- It resembles with both alkali metals and halogens to a certain extent.
- It is present in the atmosphere as dihydrogen, which is the most abundant element in the universe and the principal element in the solar atmosphere.
Isotopes of hydrogen:
Protium; 
Deuterium (Heavy hydroge…
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