FAKE TAN TIP 1: SCRUB UP. âExfoliate, exfoliate exfoliate! This will remove dead skin cells and create a smooth and uniform surface on the skin for the tan to be applied to, which will in turn result in an even golden colour.
Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms, in contrast to the transfer of electrons in ionic bonds. Such bonds lead to stable molecules if they share electrons in such a way as to create a noble gas configuration for each atom. Hydrogen gas forms the simplest covalent bond in the diatomic hydrogen molecule. The halogens such as chlorine also exist as diatomic gases by forming covalent bonds.
Only when we can answer these questions can we understand how molecules are constructed and how they behave. As we saw with the H2 molecule in Chapter 2, a bond between two atoms is formed by the sharing of a pair of electrons between the atoms. This is illustrated on the right. The bonding pair of electrons spends most of its time between the two atomic nuclei, thereby screening the positive charges from one another and enabling the nuclei to come closer together than if the bonding electrons were absent.