The Periodic Table

The Periodic Table John Newlands – 1864 – law of octaves

The Periodic Table John Newlands – 1864 – law of octaves Dmitri Mendeleeve – first periodic table predicted missing Atoms

The Periodic Table

The Periodic Table Arranged according to electronic configuration and by increasing atomic number.

The Periodic Table

Representations in chemical equations Metals – represented in their empirical formula Fe, Cu….. Non Metals – no set rule – based on most common form C, P4 If diatomic (H2, N2, O2, F2, Cl2, Br2, I2) Sulfer - is S8 but usually used as S Metaloids – like metals use empirical formula B, Si, Ge

Removal of Electrons Mn2+ has config of [Ar] 3d5 NOT [Ar] 4s23d3 Electron filling does not predict the order of electron removal in transition metals

Atomic Radius Size of atom – the volume that encompasses 90 % of the electron density. Atomic Radius – one half the distance between the two nuclei in two adjacent atoms. Determined by x-ray diffraction.