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प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas with duplet arrangement of electrons.
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उत्तर
Element is Helium
संबंधित प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas having electronic configuration: 2, 8, 8.
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.
Write the reactions of the first three alkaline earth metals with dilute hydrochloric acid.
How many electrons do inert gases have in their valence shells?
Name the gas used in:
Filling balloons
Name the gas used in:
Light bulbs
Name the gas used in:
Bright colour advertising light works
Give reason:
Alkali metals are kept in an inert solvent.
Give a reason for the following:
Group 1 [I – A] elements are called alkali metals.
