Problem 2 Analyze statements i, ii, and ii as true or false. Explain why each is

Question

Problem 2 Analyze statements i, ii, and ii as true or false. Explain why each is true or false. Circle the correct answer A through E Which of the following statement(s) is/are correct about trends in atomic and ionic radius i. Ba is larger than Sr because the last electron added has a higher value of the angular momentum quantum number () i. Within a period, atomic size decreases as you go across the periodic table from left to right (alkali metals to noble gases) because the effective nuclear charge increases. ili. A cation is always larger than the corresponding atom A. i only B. il only C. i and ii D. i and ii E. i and ii Why did you get this problem wrong on the exam and how do you intend to fix this for the final exam?

Explanation / Answer

i. Angular momentum quantum number tells about the shape of orbitals not the size so it cannot justify about Ba being smaller than Sr but the correct reason would be due to less nuclear force on valence electron.

ii. This is right and has correct explanation.

iii. A cation is always smaller than corresponding atom due to loss of one valence electron and hence nuclear charge increases.

Correct options are

ii only.

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