Members of group $1$ have similar reactivity because they have:

the same number of protons

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the same number of electrons

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similar outer shell configurations

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valence electrons with the same quantum number

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The same number of neutrons

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Solution

The correct option is A similar outer shell configurations
Option $(C)$ is correct.
Members of group 1 have similar reactivity because they have similar outer shell configurations and the reactivity increases down the group. The reactivity is due to:
Low value of first ionization energy
Large size
Low heat of atomization

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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.

_{92}^{235} P

_{92}^{238} P

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