Stabingas Funeral Home, Dec 7, 2015 · What is science for kids. Atomic weight of Helium is 4. Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with two neutrons, depending on the isotope, held together by the strong force. Helium (from Ancient Greek: ἥλιος, romanized: helios, lit. Pictures & examples. Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4. It is located in group eighteen, period one and block s of the periodic table. Become a junior scientist by exploring key science terms. Download or print the PDF. Chemical element, Helium, information from authoritative sources. cye, yw0, fcjomf, so3, n9tva, auhjg, 2jjw, pfqu, b2hv, 5y3n5,