All the elements in a particular group have the same ________.

mass number

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number of shells

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number of valence electrons

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ionisation energy

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Solution

The correct option is C number of valence electrons
Elements in a group have similar chemical properties because they have the same number of valence electrons. Valence electrons are responsible for the chemical reactivity of an element.

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All the elements in a particular group have the same ________.

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