Categories 5. Hydrogen and Helium atom Similarities Between Helium and Hydrogen Post author By Muhammad Umair Post date January 23, 2022 No Comments on Similarities Between Helium and Hydrogen Helium and Hydrogen are gaseous substances at standard temperature and pressure conditions.Both have only 1s orbital.Both are small and light substances.Both elements belong to the s block of the periodic table.Both are nonmetals. ← What is Hydrogen → Difference Between Helium and Hydrogen Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.