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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom2 Marks
Question
Which of the above elements is most reactive and why?
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Answer

Potassium is the most reactive because its valence electron is at farthest distance among the three and hence, attracted by the nucleus with a smaller force and thus, can be lost easily.

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