studybloomer
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Im confused about the answer.
Question: Predict whether an atom of 88Sr will have an atomic radius that is larger than, smaller than or the same as the atomic radius of 87Rb. Explain your answer.
Atomic radius of 88Sr compared to 87Rb

ANSWER: SMALLER
I thought it would be the same , because isotopes of the same element have same electronic configuration, hence will have same number of electron.
Does anyone understand what i mean?

Thank you,
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MrMoment
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Well, Sr and Rb are in the same period in the periodic table, but Sr has a greater atomic number. Hence, Sr has a greater nuclear charge

Isotopes don’t affect nuclear charge. So 88Sr has a higher nuclear charge than 87Rb. A higher nuclear charge means it can attract its outer electrons more, thus a smaller atomic radius.
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studybloomer
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Thanks, I think I read both as being the same element. Oops

(Original post by MrMoment)
Well, Sr and Rb are in the same period in the periodic table, but Sr has a greater atomic number. Hence, Sr has a greater nuclear charge

Isotopes don’t affect nuclear charge. So 88Sr has a higher nuclear charge than 87Rb. A higher nuclear charge means it can attract its outer electrons more, thus a smaller atomic radius.
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