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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 happens to the number of valence electrons in atoms of elements as we go down a group of the periodic table?
Name the method by which alkali metals can be extracted.
Name the first three alkaline earth metals.
Write the reactions of the first three alkaline earth metals with dilute hydrochloric acid.
Comment on the (i) reactivity (ii) colour (iii) physical state of group 17 elements.
Give reason:
Inert gases do not form compounds.
Write a short note on the following type of element –
alkali metals
State the main helpful features of the long form of the periodic table.
Give a reason for the following:
Noble gases do not form compounds readily.
