properties of the elements

Properties of an element are sometimes classed as either chemical or physical. Chemical properties are usually observed in the course of a chemical reaction, while physical properties are observed by examining a sample of the pure element. The chemical properties of an element are due to the distribution of electrons around the atom’s nucleus, particularly the outer, or valence, electrons; it is these electrons that are involved in chemical reactions. A chemical reaction does not affect the atomic nucleus; the atomic number therefore remains unchanged in a chemical reaction.

1 Alkali metals 2 alkali earth metals 3-12 Transition metals 13-15 Not all metals 17 halogens 18 Noble gases

Sodium, pottasium and highly reactive solid stored in oil low density low melting point react with O to give metal oxides react with water good conductors elec and heat

Magnesium, calcium and less reactive than alkail metal group but still reactive reacts to water to form gas and bases good conductors heat and electric

Iron, gold good conductors both hard

dont

Flourine, Bromine, Iodine can be gas liquid or solid at room temp They are non-metals Low melting and boiling points Brittle when solid Poor conductors of heat and electricity Have coloured vapours

Radon, argon and Neon RAN inert non reactive