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प्रश्न
Give reason:
Alkali metals and halogens do not occur free in nature.
उत्तर
Alkali metals and halogens are very reactive; hence, they do not occur in the free state in nature.
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संबंधित प्रश्न
Arrange the Elements of Group 17 and Group 1 According to the Given Conditions.
Increasing order of atomic size,
What is meant in the periodic table by a group?
What are the following group known as?
Group 17
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.
Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.
Name the gas used in:
Filling balloons
Give reason:
Alkali and alkaline earth metal compounds usually form electrovalent compounds.
‘The periodic table contains elements methodically grouped together’.
Name or state following with reference to the element of the first three periods of the periodic table.
An alkaline earth metal in period 3.
State the following:
The group whose elements are unreactive or inert.
