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प्रश्न
‘The modern periodic table consists of elements arranged according to their increasing atomic numbers’. With reference to elements with atomic numbers 1 to 20 only in the periodic table – differentiate them into – metallic elements, metalloids, non-metals & noble gases.
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उत्तर
Names and symbols of metal, non-metals, metalloids, and noble – gases out of 1st 20 elements.
| Metal | Symbol | Non-metal | Symbol |
| Lithium | Li | Hydrogen | H |
| Beryllium | Be | Carbon | C |
| Sodium | Na | Nitrogen | N |
| Magnesium | Mg | Oxygen | O |
| Aluminium | Al | Fluorine | F |
| Potassium | K | Phosphorus | P |
| Calcium | Ca | Sulphur | S |
| Chlorine | Cl |
| Metalloids | Symbol | Noble gas | Symbol |
| Boron | B | Helium | He |
| Silicon | Si | Neon | Ne |
| Argon | Ar |
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संबंधित प्रश्न
Fill in the blank
A pure substance has definite.................. and constant ..............
Tick the most appropriate answer.
The constituents of a mixture are present in
- a fixed ratio
- a variable ratio,
- the ratio of 2: 1
- none of these
Define Elements.
Answer the following question:
What do you understand by the statement: ‘metals are ductile and malleable’?
Find the atomicity of the Following molecule:
Dinitrogen Oxide
Fill in the blank
A diatomic gaseous element is _______.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – a gas with a pungent, choking odour which is lighter than air
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture
Two or more coloured constituents are soluble in some solvent.
Reason out
Elements are called semimetals.
