Electron Configuration Worksheet

Chem 201A

Dr. Baxley

1. In what way are the electron configurations of H, Li, Na, K, Rb and Cs similar? In what way

are the electron configurations of O, S, Se, Te and Po similar?

2. Identify the following atoms or ions:

a. It has the ground-state configuration [Ar] 4s

b. It has the ground-state configuration [Kr]4d

c. It forms a –3 ion that is isoelectronic with Kr

3. Write out BOTH the full electron configuration and the abbreviated electron configuration

for each of the following. Predict if the atom would be paramagnetic or diamagnetic.

4. For each of the atoms listed in the problem above, give the number of inner (core) and outer

(valence) electrons and then list a set of quantum numbers representing an electron of highest

energy (one of the last electrons to fill).

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