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Which of the following is true regarding the reactivity of alkali metals towards a particular halogen?

Which of the following is true regarding the reactivity of alkali metals towards a particular halogen? Correct Answer Rubidium is greater than that of sodium

Alkali metals combine readily with halogens to form ionic halides. The reactivity order of alkali metals towards a particular halogen increase in the order; lithium, sodium, potassium, rubidium, and cesium.

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