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(a) "Atomic number of two elements ar 9 ...

(a) "Atomic number of two elements ar 9 and 17 respectively. Both elements belong to the same group"- explain.
(b) Name a transition element ad an alkali earth metal.

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(a) they have similar electronic configuration of the outermost shell `(ns^(2)np^(5))`
(b) `Fe,Ca`.
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CHHAYA PUBLICATION-CLASSIFICATION OF ELEMENTS & PERIODICITY IN PROPERTIES-SHORT-TYPE QUESTIONS
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  2. Justify the position of zero group in Mendeleev's periodic table.

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  3. (a) "Atomic number of two elements ar 9 and 17 respectively. Both elem...

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  17. Electron affinity of inert elements are positive-why?

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  18. B(2)O(3) is acidic in nature but BeO is amphoteric-why?

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