The atomic numbers of elements A,B,C and D are 9, 18, 53 and 35 respectively. Which element differs from the remaining elements from the point of view of their position in periodic table ? (A) A (B) B (C) C (D) D
GSEB - Class 9 Chapter - 3.Periodic Classification of Elements Page 31
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18 because this is zero grp element , others are 17 grp element
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C) Cbecause it lies in 18 group which means that it is an inert gas,whaereas 9,17 and 35 atomic number elements lie in 17 group
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