Answer:
because, it resembles the properties of alkali earth metals as well as halogens ! OwO
Step-by-step explanation:
" Hydrogen resembles the properties of alkali earth metals as well as halogens. Hydrogen has one electron in its valence shell and it also needs one more electron to get stable. ... For this the hydrogen is placed separately in periodic table ! "
P.s: sharky said thanks for the points !