Noble gases do not combine with other elements to form molecules.
Elements of the Zero group, which is the 18th vertical column, are known as inert gases or noble gases. They have 8 electrons in their outermost orbits (except He, which has only 2). They do not react with other elements and are, therefore, inert. The shells of noble gas atoms are completely filled. As a result, they remain unresponsive. A stable configuration is formed by two electrons in the first and only shell of helium (He) and eight electrons in the outermost shells of other noble gases. This explains their lack of reaction. An octet is a group of eight electrons in an atom's outermost shell. A duplet is made up of two electrons in helium's outermost shell.
