2.2.2 s and p block elements

what 2 things increase the strength of the metallic bond

the charge on the ion

the radius of the metal ion

what is the relationship between charge on the ion and the strength of metallic bond

as the charge on ion increases, strength of metallic bond increases

why

greater the charge, greater the number of electrons in the sea of delocalised electrons and the greater the charge difference between the ions and electrons. greater charge difference leads to stronger electrostatic attraction and so stronger metallic bond

what does this increases across the period

charge on the ion increases across a period so melting point increases

how does the atomic radius affect the strength of metallic bond

smaller ionic radius stronger metallic bond

why

smaller radius, stronger attraction from ion to sea of delocalised electrons. more attraction means stronger metallic bond

what does this mean down a period

ionic radius increases down a group as ion increases in size so metallic bond weakens and melting point lower