All the elements in a group have?

Same mass number

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Same number of shells

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Same number of valance electrons

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None of these

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Solution

The correct option is C
Same number of valance electrons

Chemical properties depend on valence electrons of the respective atoms.

Since elements in a group have similar chemical properties, their electronic arrangement and consequently the number of valence electrons are same.

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Similar questions

Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

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