PROPERTIES OF METALS
Physical properties
- Physical state: All metals are solids at room temperature except mercury and gallium.
- Lustre: Metals possess a high lustre (called metallic lustre).
- Hardness: Most of the metals are hard and strong (exceptions: sodium and potassium can be cut with a knife)
- Melting point and Boiling point: Usually, metals possess high melting and boiling points and vaporize only at high temperatures (exceptions: gallium, mercury, sodium and potassium).
- Density: Metals have a high density (exceptions: sodium and potassium are less dense than water).
- Ductility: Metals are usually ductile. In other words, they can be drawn into thin wires without breaking.
- Malleability: Metals are usually malleable, Le, they can be beaten into thin sheets without cracking (except zinc and mercury).
- Conduction of heat and electricity: Metals are good conductors of heat and electricity; silver and copper excel in this property (exception: tungsten)
- Solubility: Usually, metals do not dissolve in liquid solvents.
Chemical Properties
- Valence electrons: Atoms of metals usually have 1,2 or 3 electrons in their outermost shell.
- Formation of ions: Metals form Positive ions by the loss of electrons and hence they are electro-positive.
- Discharge of ions: Metals are discharged at the cathode during the electrolysis of their compounds.
- Atomicity: Molecules of metals in their vapour state are usually monoatomic.
- Nature of oxides: Oxides of metals are usually basic.
Also Read
- Carbon / கார்பன்
- Nitrogen and their compounds / நைட்ரஜன் மற்றும் அதன் சேர்மங்கள்
- Fertilizer / உரங்கள்
- Pesticides / களைக்கொல்லி
- Insecticides / பூச்சிக்கொல்லி
- Blood and blood circulation / இரத்தம் மற்றும் இரத்த சுழற்சி மண்டலங்கள்
- Endocrine system reproductive system / நாளமில்லா சுரப்பி மண்டலம், இனப்பெருக்க மண்டலம்
- Nature of universe / பேரண்டத்தில் இயல்புகள்
- General Scientific Law / பொது அறிவியல் விதிகள்
- Heat, Light and Sound / ஒளி,ஒலி மற்றும் வெப்பம்
- Electricity and Electronics / மின்னியல் மற்றும் மின்னணுவியல்