SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which statement explains why the reactivity of Group 1 elements increase when going down the group?
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The melting point of the elements decreases
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The valence electrons gets further away from the nucleus
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The attractive force between valence electron and the nucleus becomes stronger.
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The physical state of the elements changes from gas to liquid then to solid at room temperature.
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Explanation:
Detailed explanation-1: -The reactivities of the halogens(17th group) decrease down the group ( At < I < Br < Cl < F). This is due to the fact that atomic radius increases in size with an increase of electronic energy levels. This lessens the attraction for valence electrons of other atoms, decreasing reactivity.
Detailed explanation-2: -Because they have just one valence electron, group 1 elements are very reactive. As a result, they are found in nature only in combination with other elements.
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