The atoms are the same size in metallic elements, they form giant structures so the layers are arranged in regular patterns. You can see some metal crystals on the syrface of some metals. You can grown metal crystals by displacement reaction.
Higher- Tier - When the metals are packed together the electrons in the highest energy level so the outer shell delocalise and move from one atom to another. Which produces a positive ions in a 'sea' of moving electrons. The delocalised elcetrons strongly attract the positively charged ions which hold the structure together.
High melting and boiling points There are very strong forces between the fixed bonds and electrons so alot of energy is required to break the bonds. Very good electrical and thermal conductivity. The delocalised electrons are able to move freely in the 'sea'. Therefore are able to carry charge or heat energy.
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