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प्रश्न
Write a short note on the following type of element –
noble gases
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उत्तर
Element of 18th or O group (He, Ne, Ar, Kr, Xe, Rn) is called noble gases as they are inert gases and have valency 0. All are mono-atomic.
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संबंधित प्रश्न
Consider the following elements: Be, Li, Na, Ca, K. Name the elements of (a) same group (b) same period.
Name the alkali metals, How many electron(s) they have in their outermost orbit.
Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.
Name the first three alkaline earth metals.
Name the gas used in:
Light bulbs
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
Give reason:
Inert gases do not form compounds.
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 |
