What are the two main types of chemical bonds?

Ionic and Covalent

is when one atom gains an electron from the other atom and both become ions (hence: Ionic bonding). the atom that loses the electron becomes positively charged and the atom that gains the electron becomes negatively charged. the force of attraction between the two is what causes the bond. the atom that gains the electron needed one more electron to have a full outer shell. the atom that loses the electron needed one less electron to have a full outer shell. since both now have a full outer shell, they are stable (or happy).

is where two atoms share an electron without losing or gaining one. both of the atoms need one more electron to have a full outer shell, so they share one of their electrons with the other atom. this causes both atoms to have a full outer shell, so they are stable (or happy).