Liquid: melting point (M.P.) less than 25☌ but boiling point (B.P.) is greater than 25☌.Solid: melting point (M.P.) is greater than 25☌.electrical insulators (non-conductors of electricity)įirst, let's determine the state of each element at room temperature (25☌) and pressure (100 kPa):.Non-metals usually have low melting and boiling points. solids, liquids or gases at room temperature and pressure.That is, metals have high melting point and boiling points (Except for mercury and the Group 1 (group IA or alkali metals) metals which have low melting and boiling points compared to other metals) solids at room temperature and pressure (Except mercury which is a liquid metal).hard (EXCEPT Group 1, group IA or alkali metals, metals which are quite soft).Play the game now! Trend in Physical Properties of Period 3 Elementsįirst, let's compare the physical properties of metals and non-metals. The general trends in the properties of period 3 elements are summarised in the table below:.(II) aqueous solutions: basic on the left to amphoteric to acidic on the right (I) bond type: ionic on the left to covalent on the right (II) aqueous solutions: neutral on the left to acidic on the right (I) bond type: ionic chlorides on the left to covalent chlorides on the right (v) colour changes from grey on the left to coloured on the right (iv) metallic lustre on the left to dull on the right (iii) electrical and heat conductors on the left to insulators on the right (ii) boiling points change from high to low (i) melting points change from high to low (g) elements on the left are metals, elements on the right are non-metals: (f) electronegativity increases (excluding argon) (b) number of valence electrons increases (a) atomic number, and therefore charge on the nucleus (nuclear or core charge) increases The following general trends are observed as you go across period 3 from left to right:.

Sodiums atomic radius