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Atomic numbers of some elements are give...

Atomic numbers of some elements are given below. Classify them into three groups so that the two elements in each group exhibit identical chemical behaviour: 9,12,16,34,53,56.

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Elements with atojmic number 9 and 532 belongs to p-block is and they have similar outer electronic configuration `(ns^(2)np^(5))` so they will wxhibit similar chemical propeties. Their group number=(10+2+5)=17. elements with atomic number 12 and 56 belong to s-block and they have similar outer electronic configuration `(ns^(2))`. so they will exhibit similar chemical properties. their group number=2. elements with atomic number 16 and 34 belong to p-block and they have similar outer electronic configuration `(ns^(2)np^(4))`. so, they will wxhibit similar chemical properties. their group pnumber (=10+2+4)=16. so, on the basis of similarity in chemical properties the given elements are divided into three groups.
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