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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
Consider the following elements: Be, Li, Na, Ca, K. Name the elements of (a) same group (b) same period.
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.
How do alkaline earth metals occur in nature?
Write the electronic configuration of the first two alkaline earth metals.
Give reason:
Alkali metals are kept in an inert solvent.
Give reason:
Alkali metals and halogens do not occur free in nature.
State the characteristics which remain similar in moving down in a group of the periodic table.
Write a short note on the following type of element –
alkaline earth metals
