What is the first element in the periodic table?

Hydrogen, with an atomic number of 1, is the first element in the periodic table. It is the simplest and most abundant element in the universe, consisting of one proton and one electron. Its properties make it fundamental to chemistry and energy applications. Options A (Helium, atomic number 2), C (Lithium, atomic number 3), and D (Beryllium, atomic number 4) are incorrect, as Hydrogen holds the primary position in the periodic table’s structure.