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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.
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?
Comment on the (i) reactivity (ii) colour (iii) physical state of group 17 elements.
Name the gas used in:
Filling balloons
Name the gas used in:
Light bulbs
Give reason:
Alkali metals and halogens do not occur free in nature.
‘The periodic table contains elements methodically grouped together’.
State the main helpful features of the long form of the periodic table.
State the following:
The group whose elements are unreactive or inert.
State the following:
The group which contains highly reactive electronegative non-metals including chlorine.
