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प्रश्न
Name the gas used in:
Filling balloons
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उत्तर
Helium
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संबंधित प्रश्न
What are the following group known as?
Group 18
What happens to the number of valence electrons in atoms of elements as we go down a group of the periodic table?
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.
Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.
Name the first three alkaline earth metals.
How many electrons do inert gases have in their valence shells?
Name the gas used in:
Light bulbs
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
‘The periodic table contains elements methodically grouped together’.
State the following:
The group from the groups 1 [IA], 2 [IIA], 16 [VIA] and 7 [VIIA] whose elements are most electronegative.
