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Question

Which of the following sets of elements do not belong to the same group?


A
F,Cl,Br
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B
Na,K,Rb
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C
P,S,Cl
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D
C,Si,Ge
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Solution

The correct option is C P,S,Cl

All the elements in a particular group have the same number of valence electrons and hence possess similar chemical properties. Among the given options:

a) F,Cl,Br are classified as halogens and have 7 valence electrons. Thus they belong to group 17 of the periodic table.

b) Na,K,Rb are classified as alkali metals and have 1 valence electron. These elements are present in group 1 of the periodic table.

c) Phosphorus has 5 valence electrons and belongs to group 15.
Sulphur has 6 valence electrons and belongs to group 16.
Chlorine has 7 valence electrons and thus belongs to group 17 in the modern periodic table.

d) C,Si,Ge belong to the carbon family and have 4 valence electrons, and they are present in group 14 of the periodic table.


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