Hydrogen (H) is typically placed at the top of Group 1 on the Periodic Table. However, Group 1 consists of the allall metals and hydrogen is not a metal What reason best explains why hydrogen is placed in this group?

A Hydrogen and the other alkall metals have similar physical properties

B Hydrogen was the first element to be discovered so it is placed first on the periodic table

C Hydrogen has the same number of valence electrons as the alkall metals

D There isn't a space available to place hydrogen with the other nonmetals