metals, non metals and metalloids questions

All elements except hydrogen, which form positive ions by losing electrons during chemical reactions are called metals. Thus metals are electropositive elements. They are characterized by bright lustre, hardness, ability to resonate sound and are excellent conductors of heat an..

Besides the above reactions of chlorine with metals, chlorine also undergoes addition reactions with heated metals like aluminium, zinc, iron, etc. to form their chlorides. Metals with variable valencies always form the chloride of the higher metallic valenc..

Thin foils of metals like sodium, copper, etc. when plunged into a jar of chlorine gas catch fire spontaneously to form their respective chlorides (Fig.14.10). ..

Be, Cd, Co, Mg and Zn - have hcp structure. Al, Ag, Au, Cu, Ni and Pt - have ccp structu..

Refining of Metals - The metals so extracted are further refined by suitable methods. The electrolytic method is the most suitable method for refining the non-ferrous metals. The metals produced by any method given above are not very pure. These nee..

The elements of group 15 are less metallic. However on going down the group, the metallic character increases from N to Bi. For e.g.,, N and P are non-metallic, As and Sb are partly non-metallic while Bi is a metal...

fig 1.22 - Overlapping of s and p bands in group II elements Metals are extreme examples of delocalized electrons. In a metallic crystal the electrons are free to move throughout the crystal. However, the metal ions are fixed in position and can only vibrate. When a ..

. Lead corrodes to a white lead oxide or carbonate and copper corrodes to form a basic green carbonate (combination of the hydroxide Cu(OH) 2 and carbonate CuCO 3 ). In the past both metals have been used for piping but as lead is considered too toxic copper is usually used. Non..

Sl. No Non - metal Physical State Symbol 1. Hydrogen Gas H 2. Nitrogen Gas N 3. Oxygen Gas O 4. Fluorine Gas F 5. Chlorine Gas Cl 6. Bromine Liquid Br 7. Astatine Solid At 8. Carbon Solid C 9. Iodine Solid I 10. ..