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=Metals and Non Metals=

metals
Metals appear lustrous (beneath any patina); form mixtures (alloys) when combined with other metals; tend to lose or share electrons when they react with other substances; and each forms at least one predominately basic oxide.

non metels
Nonmetals have open structures (unless solidified from gaseous or liquid forms); tend to gain or share electrons when they react with other substances; and do not form distinctly basic oxides.

Most are gases at room temperature; have relatively low densities; are poor electrical and thermal conductors; have relatively high ionisation energies and electronegativities; form acidic oxides; and are found naturally in uncombined states in large amounts.

metals
Lustre: Metals have the quality of reflecting light from its surface and can be polished e.g., gold, silver and copper.

Malleability: Metals have the ability to withstand hammering and can be made into thin sheets known as foils.

Ductility: Metals can be drawn into wires. 100 gm of silver can be drawn into a thin wire about 200 meters long.

Hardness: All metals are hard except sodium and potassium, which are soft and can be cut with a knife.

Valency: Metals have 1 to 3 electrons in the outermost shell of their atoms.

Conduction: Metals are good conductors because they have free electrons. Silver and copper are the two best conductors of heat and electricity. Lead is the poorest conductor of heat. Bismuth, mercury and iron are also poor conductors.

Density: Metals have high density and are very heavy. Iridium and osmium have the highest densities where as lithium has the lowest density. Perfringens.

non metals
Physical state: Most of the non-metals exist in two of the three states of matter at room temperature: gases (oxygen) and solids (carbon). These have no metallic lustre, and do not reflect light.

Nature: Non-metals are very brittle, and cannot be rolled into wires or pounded into sheets.

Conduction: They are poor conductors of heat and electricity.

Electronegative Character: Non-metals have a tendency to gain or share electrons with other atoms. They are electronegative in character.

Reactivity: They generally form acidic or neutral oxides with oxygen. Metals and Non-Metals - Compared Back to Top

metals
Reaction of metals with oxygen:

Metals form their oxides when react with oxygen. metal nonmetal1

Metal oxides are basic in nature

non metals
Reaction of Non-metals with oxygen:

Non-metals forms their oxides when react with oxygen. metal nonmetal5

Thus,

Non-metal forms their oxide when reacts with oxygen.

Non-metal oxides are acidic in nature.