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Both are ions and we should consider the ionic radius, not the atomic radius.

Rubidium ion (Rb+) will have a larger IONIC radius than strontium ion (Sr2+).

Both ions have the same electronic configuration. But strontium ion has more number of protons in the nucleus. Hence it will have greater force of attraction between the nucleus and the valence electrons, resulting in smaller size.

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11y ago
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Q: Where is the lowest electronegativity barium calcium magnesium or strontium?
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