The picture shows a close-up of one carbon atom. A hydrogen atom has one proton as the nucleus and one electron in the region outside the nucleus. The electron and proton are attracted to each other.

The formula H₂O shows that water is made from two atoms of hydrogen (H) bonded to one atom of oxygen (O). Katie: Time for some science. And today it's a chemistry classic, the periodic table.

The little number written at the lower right after an atom (subscript) tells how many of that atom are in the molecule. The big number written in front of a molecule (coefficient) shows how many of ...

Relative formula masses can be calculated and used ... of solution and uncertainties in measurements. Calculations in chemistry (Higher) - AQA The mole is the unit for amount of substance.

In a chemical bond, the more electronegative atom gains extra electrons ... Pauling deduced his electronegativity values from thermo-chemistry using the energies of some chemical bonds. He proposed ...