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प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Group whose elements have zero valencies.
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उत्तर १
Noble gases
उत्तर २
Group is 18th or O group
संबंधित प्रश्न
Name two elements of each group.
Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.
Name the method by which alkali metals can be extracted.
Name the gas used in:
Filling balloons
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
Write a short note on the following type of element –
alkaline earth metals
Write a short note on the following type of element –
noble gases
‘The periodic table contains elements methodically grouped together’.
Select the correct answer from the options given below.
The most reactive halogen from group 17.
Give a reason for the following:
Noble gases do not form compounds readily.
