Question

Assertion - Cesium and fluorine both reacts violently. Reason - Cesium is most electropositive and fluorine is most electronegative.
.(a) Both Assertion and Reason are correct statements and Reason is the correct explanation of the Assertion.
(b) Both Assertion and Reason are correct statements, but Reason is not the correct explanation of the Assertion.
(c) Assertion is correct, but Reason is incorrect statement.
(d) Assertion is incorrect but Reason is correct statement.
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Answer 1

Explanation:

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Answer 2

Cesium is most electropositive and fluorine is most electronegative, hence they are highly reactive. So (a) Both Assertion and Reason are correct statements and Reason is the correct explanation of the Assertion.

Explanation:

• Electropositive and electronegative elements are generally highly reactive with other elements.

• Cesium atom has 55 electrons and its electronic configuration is [$1s^{2}2s^{2} 2p^{6}3s^{2} 3p^{6} 3d^{10}4s^{2}4p^{6} 4d^{10} 5s^{2}5p^{6} 6s^{1}$]. During reactions the cesium atom loses its outermost electron($6s^{1}$) due to its electropositive nature.

• Its is electropositive due to its low effective nuclear charge and hence they are highly reactive with other elements.

• Fluorine atom has 9 electrons and its electronic configuration is [$1s^{2}2s^{2} 2p^{5}$]. During reactions the fluorine atom accepts electrons readily to fill its last orbital (from $2p^{5}$ to $2p^{6}$) due to its electronegative nature.

• It is electronegative due to its high effective nuclear charge and is highly reactive with other elements.