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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
Give one example for the following types of mixtures:
liquid-gas homogenous mixture
Define a pure substance. How many types of pure substances do you know?
Indicate whether the following statement is true or false:
Molecules can exist independently.
Indicate whether the following statement is true or false:
Noble gases are high reactive
Tick (√) the correct alternative from the choice given for the following statement.
Brass and bronze are
Give the name of the radical - CO3
Match the separation of components in List I with the most appropriate process in List II.
| List I | List II |
| 1. Naphthalene from naphthalene & sodium chloride. | A: Separating funnel |
| 2. Cream from milk. | B: Sublimation |
| 3. Kerosene oil from kerosene oil & water. | C: Boiling |
| 4. Lead nitrate from an aqueous solution of lead nitrate. | D: Centrifugation |
| 5. Ammonia from an aqueous solution of ammonia. | E: Distillation |
Name the constituents of water.
Reason out
Elements are called semimetals.
Give the chemical formula for cane sugar.
