4.5.1: Practice Electronic Structure

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Exercise \(\PageIndex{1}\)

Which orbital is the next to fill after the 4s orbital?

Answer: 3d orbital

Exercise \(\PageIndex{1}\)

Which orbital sublevel does NOT exist?

a) 3d

b) 4f

c) 2d

d) all exist

Answer: c (The main level 2 only has 2s and 2p sublevels.)

Exercise \(\PageIndex{1}\)

How many electrons can fit in the 4d sublevel?

Answer: 10 electrons

Exercise \(\PageIndex{1}\)

Give the electron configuration for each of the following atoms.

a) Zn

b) K

c) Br

Answer a: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ (total of 30 electrons)
Answer b: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ (total of 19 electrons)
Answer c: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵ (total of 35 electrons)

Exercise \(\PageIndex{1}\)

Give the electron configuration for each of the following ions.

d) O^2–

e) K¹⁺

f) Br^1–

Answer d: 1s² 2s² 2p⁶ (total of 10 electrons)
Answer e: 1s² 2s² 2p⁶ 3s² 3p⁶ (total of 18 electrons)
Answer f: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ (total of 36 electrons)