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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Mendeleef’s Periodic Table is upset by the fact that

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Correct option: A

Many elements has several isotopes

Option A (Many elements has several isotopes) is correct because the existence of isotopes with different atomic masses challenged Mendeleev's periodic law, which was based on atomic weights.

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The compounds of the s-block elements, with the exception of lithium and ...

X

... are predominantly ionic. Here,

X

refers to Among the following elements, the most electronegative is: The pair of amphoteric hydroxides is The element with atomic number 117 if discovered would be placed in The correct order of size among

\mathrm{O}, \mathrm{O}^{2-}, \mathrm{F}

and

\mathrm{F}^{-}

is: The electronic configuration of four elements are given below. Which elements does not belong to the same family as others?