What is the maximum covalency of hydrogen? Whether 1 or 2? why?

@ priyanshu 
nitrogen is restricted upto a covalency of 4 . 
REASON – Normally when the N atom bonds it forms 3 covalent bonds with one pair of nonbonding electrons. Hence, N normally has a covalency of 3 with an available pair of electrons. But, when a proton, or other group that is able to bond with a pair of electrons coodinates with the central N atom a 4th covalent bond is formed. Beyond the 4th bond there is no more capability of the N atom to form additional bonds so it can only have a maximum covalency of 4. 
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@umakant biswal.. i asked the maximum covalency of “hydrogen” not nitrogen. read the question carefully and then answer.

 

@ priyanshu

Since H atom has only 1 s orbital and one unpaired electron, it can share only 2 electrons in making covalent bond. Thsu Hydrogen has a maximum covalency of H atom is 2/2 = 1