The periodic table arranges all chemical elements in special ways. Different types of chemical bonding, and patterns and trends can be observed in their arrangement.
Discrete covalent molecules are small groups of atoms held together by strong covalent bondA bond between atoms formed when atoms share electrons to achieve a full outer shell of electrons. inside the molecule and weak intermolcular forces between the molecules.
The covalent bond itself is a shared pair of electrons electrostatically attracted to the positive nuclei of two non-metal atoms. The atoms achieve a stable outer electron arrangement (a noble gas arrangement) by sharing electrons.
Most of the discrete covalent molecules are diatomic elements:
Hydrogen (H2)
Nitrogen (N2)
Oxygen (O2)
Fluorine (F2)
Chlorine (Cl2)
There are also some larger covalent molecular elements:
Phosphorous (P4)
Sulfur (S8)
Fullerenes (C60)
Figure caption,
Covalent molecules of Phosphorous, Sulfur and Fullerene