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1) a) How many electrons does an iron (Fe) atom have in its 3d subshell?

    b) How many of those electrons are unpaired?

2) Determine the element of the lowest atomic number that contains a half-filled d subshell in the ground state.

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Kenneth Duque
Kenneth DuqueLv10
21 Sep 2020

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Related questions

1. What is wrong with the notation 1s22s22p63s23p63d104s24p2 for germanium (atomic number 32)?

a. The 4s subshell should appear before the 3d subshell.

b. The 3p subshell should have more than 6 electrons.

c. The 3d subshell can hold only 8 electrons.

d. The 4d subshell should receive electrons before the 4p subshell.

 

2. Why should the 4s subshell be filled before the 3d?

a. The 4s subshell has greater spherical symmetry than the 3d subshell.

b. The 4s subshell is farther from the nucleus than the 3d subshell.

c. The 4s subshell is at lower energy than the 3d subshell.

d. The 4s subshell holds fewer electrons than the 3d subshell.

 

3. Write the electron configuration for the Na+ ion, which has ten electrons.

 

4. Write the electron configuration for the Br- ion, which has thirty-six electrons.

Give the symbol of the element of lowest atomic number whose ground state has:

(a) a completed f subshell.

(b) twenty p electrons.

(c) two 4d electrons.

(d) five 5p electrons.

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