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प्रश्न
Give reason:
Alkali metals and halogens do not occur free in nature.
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उत्तर
Alkali metals and halogens are very reactive; hence, they do not occur in the free state in nature.
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संबंधित प्रश्न
What is meant in the periodic table by a group?
What are the following group known as?
Group 1
Name the gas used in:
Light bulbs
Name the gas used in:
Bright colour advertising light works
State the characteristics which remain similar in moving down in a group of the periodic table.
Write a short note on the following type of element –
halogens
Name or state following with reference to the element of the first three periods of the periodic table.
An alkaline earth metal in period 3.
Select the correct answer from the options given below.
The most reactive halogen from group 17.
State the following:
The group whose elements are unreactive or inert.
Match the elements of List – I with their type from List – II.
| List – I | List – II |
| 1. Highly reactive, univalent metals | A: Halogens |
| 2. Highly reactive, univalent non-metals | B: Transition elements |
| 3. Unreactive, inert elements | C: Alkali metals |
| 4. Elements of group 3 to 12 [IB to VII B and VIII] | D: Lanthanide series |
| 5. Radioactive elements | E: Noble gases |
| F: Actinide series |
