Helium is a chemical element of group 18 (noble gases) that belongs to the first period of the periodic table. The name “noble gases” suggests that they tend to be non-reactive, analogous to noble metals, which hardly react. Helium has two electrons, which complete the 1s2 shell, unlike the other noble gases, which have a … Read more
Electronic Structure Hydrogen has the simplest atomic structure of any other chemical element, its nucleus contains one proton with a +1 charge, with a surrounding electron and electron configuration 1s¹. Hydrogen atoms can achieve stability in three different ways: By forming a covalent bond (a pair of electrons) with other atoms; By losing an electron … Read more