Download 22 diatomic molecules

Diatomic molecules
Molecules made up of only two atoms are called diatomic molecules (two atom), e.g.
hydrogen chloride, HCl (one carbon atom and one chlorine atom), and carbon monoxide,
CO, (one carbon atom and one oxygen atom).
Certain elements normally exist as diatomic molecules. Since diatomic molecules contain
two atoms, the chemical formula for an element that is made up of diatomic molecules is X 2,
where X is the symbol for the element, e.g. hydrogen is written H2.
Hydrogen has a single covalent bond between the two atoms in the molecule:
Oxygen has a double covalent bond between the two atoms in the molecule:
Nitrogen has a triple covalent bond between the two atoms in the molecule:
Complete the following table to show the seven common elements in the Periodic
Table that exist as diatomic molecules.
Element
Chemical formula
How are you going to remember these elements?
Find astatine (atomic number 85) in the Periodic Table.
Do you think astatine is likely to exist as atoms or molecules? Explain.
Chemical Changes and Structure
Covalent bonding 3