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Tom [10]
3 years ago
12

Which of the following is true regarding the inner transition elements? A. These include all elements in groups 3–12. B. They oc

cupy the d block of the periodic table. C. These include the lanthanides and actinides and do not have f sublevels. D. Their valence electrons can be located in both s and f sublevels.
Chemistry
2 answers:
sesenic [268]3 years ago
7 0

Answer:

D. Their valence electrons can be in both s and f sublevels.

Explanation:

The inner transition elements are those in the two long rows at the bottom of the Periodic Table.

The <em>lanthanide series </em>starts after Ba in Period 6, and the <em>actinide series</em> starts after Ra in Period 7.

Thus, we would predict their electron configurations to be of the form

n\text{s}^{2}(n-2)\text{f}^{n}

However, the energy levels of the <em>n</em>s, (<em>n</em>-1)d, and (<em>n</em>-2)f orbitals are so close in energy that there are many exceptions to our predictions

For example, here are some electron configurations.

La = [Xe]6s²5d (not [Xe]6s²4f)

Ce = [Xe]6s²4f5d (not [Xe]6s²4f²)

Pr = [Xe]6s²4f³ (as predicted)

Thus, their valence electrons can be in both s and f (and sometimes d) sublevels.

A. <em>Wrong</em>. The inner transition elements do not include the elements in Groups 3 to 12. They are the elements between Groups 2 and 3.

B. <em>Wrong.</em> They do not occupy the d block (those are the transition metals). They occupy the f block.

C. <em>Wrong</em>. They include the lanthanides and actinides, but most of them have at least one electron in an f sublevel.

Triss [41]3 years ago
5 0

I think B is your answer

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