Why is Hydrogen placed in group $I$ of the modern periodic table ?

$(1)$ It shows outer electronic configuration similar to group $I$ elements (i.e.$1s^1$).

$(2)$ It readily looses its electron to form $H^{+}$ ion which resembles the electropositive character of group $I$ elements.

$(3)$ It shows $+1$ oxidation state like alkali i.e. group $I$ elements.

$(4)$ Hydrogen also acts as a strong reducing agent like alkali metals and also forms binary compounds with electronegative elements which resembles the group $I$ elements.