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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
What is meant in the periodic table by a group?
What are the following group known as?
Group 1
Name two elements of each group.
Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.
Comment on the (i) reactivity (ii) colour (iii) physical state of group 17 elements.
Name the gas used in:
Light bulbs
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
Write a short note on the following type of element –
noble gases
‘The periodic table contains elements methodically grouped together’.
Give a reason for the following:
Group 1 [I – A] elements are called alkali metals.
