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प्रश्न
Elements are mainly classified into metals and non-metals. State six properties of metals which differ from non-metals.
उत्तर
Properties | Metals | Non-metals |
1. State | Metals are generally solids at room temperature. | Non-metals are gases, liquids, soft solids at room temperature. |
2. Lustrous | Metals have lustre i.e. shine. | Non-metals do not have lustre i.e. do not shine. |
3. Malleability | Metals are malleable i.e. can be beaten into sheets. | Non-metals are non-malleable i.e. cannot be beaten into sheets. |
4. Ductility | Metals are ductile i.e. can be drawn into wires. | Non-metals are non-ductile i.e. cannot be drawn into wires. |
5. Conductivity | Metals are good conductors of heat and electricity. | Non-metal are poor conductors of heat and electricity. |
6. Melting and Boiling point | Metals have high melting and boiling points. | Non-metals have low melting and boiling points. |
7. Density | Metals have high density. | Non-metals have low density. |
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संबंधित प्रश्न
How are the elements with variable valency named? Explain with an example.
Match the non-metallic elements – with their correct symbols. Non-metallic elements are:
Non-Metallic elements | Symbol |
(a) Carbon | (1) O |
(b) Chlorine | (2) I |
(c) Oxygen | (3) Si |
(d) Phosphorus | (4) C |
(e) Hydrogen | (5) Cl |
(f) Nitrogen | (6) P |
(g) Iodine | (7) F |
(h) Bromine | (8) H |
(i) Fluorine | (9) S |
(j) Silicon | (10) Br |
(k) Sulphur | (11) N |
In the chemical word equation – Zinc + Sulphuric acid → Zinc sulphate + Hydrogen
The molecular equation is :
Zn + H2SO4 → ZnSO4 + H2[g].
State what [g] represents.
Give the symbol of the following element:
Neon
Give the symbol of the following element:
Hydroxide
Write the radical of the following valency:
Aluminium
Write the radical of the following valency:
Sulphur [Sulphide]
Write the radical of the following valency:
Calcium
Write the chemical formula of the following:
magnesium sulphate
What is the expansion of IUPAC.