Dot and cross models
Dot and cross models show how a pair of Subatomic particle, with a negative charge and a negligible mass relative to protons and neutrons. form a A bond between atoms formed when atoms share electrons to achieve a full outer shell of electrons.. Notice that in the diagrams, only the electrons in the outer shell of each All elements are made of atoms. An atom consists of a nucleus containing protons and neutrons, surrounded by electrons. are shown.