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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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Consider the ions Sc 3 + ,  Cl ,  Ca 2 + ,  and S 2 . Match these ions to the following pictures that represent the relative sizes of the ions.

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Interpretation Introduction

Interpretation:

The given ions corresponding to the pictures that show their relative sizes are to be matched.

Concept Introduction:

The total distance that exists between the nucleus and the valence shell electrons of an atom is known to be the atomic size or atomic radius of that atom. According to the periodic table, the atomic size increases while going down the group and decreases while moving left to right in the period.

The ionic radius also increases while going down the group and decreases while moving left to right in the period.

Explanation

The given set of ions is shown as,

Sc3+, K+, Cl, Ca2+ and S2

The given ions are isoelectronic that means they have equal number of electrons in their shells. The total number of electrons present in Sc3+, K+, Cl, Ca2+ and S2 is 18. But the nuclear charges of all the ions are different from each other. The increased number of protons corresponds to the more attraction of electrons towards the nucleus that results in the decrease of atomic size

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