# Worksheet: Electron Configurations of Transition Elements

In this worksheet, we will practice using the periodic table to deduce the electron configurations of transition elements.

**Q5: **

The f-block elements have more complex electron configuration rules than most of the periodic table. However, the electronic structure of terbium follows the same rules as main-group elements. What is the electronic configuration of the atom?

- A1s
^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^{6}4f^{8}5d^{1}6s^{2} - B1s
^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^{6}4f^{10}6s^{1} - C1s
^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^{6}4f^{9}6s^{2} - D1s
^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^{6}4f^{11} - E1s
^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}4d^{10}5s^{2}5p^{6}4f^{8}5d^{2}6s^{1}

**Q6: **

Which atom has the electron configuration 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{1} 4s^{2}?

- A
- B
- C
- D
- E

**Q17: **

The electron configuration of the gadolinium atom is 4f^{7}
5d^{1} 6s^{2}. What is the electron configuration of ?

- A 4f
^{4}5d^{1}6s^{2} - B 4f
^{5}6s^{2} - C 4f
^{7} - D 4f
^{6}6s^{1} - E 4f
^{6}5d^{1}

**Q18: **

Which of the following atoms or ions possesses a full-valence s orbital in its ground state?

- A
- B
- C
- D
- E

**Q19: **

Which of the following atoms possesses a full-valence s orbital?

- A
- B
- C
- D
- E