Che 121 Problem Paper 4 Chemistry Worksheet With Answers

CHE 121 Problem Paper 4

1. What is the Aufbau principle?

The Aufbau principle is used to determine the electron configuration

of an atom, molecule or ion. According to the principle, electrons fill

orbitals starting at the lowest available energy states before filling

higher energy states.

2. Which lies highest in energy a 3s or 4d subshell?

4d subshell

3. What is Hund’s rule?

Hund's rule says that if multiple orbitals of the same energy are

available unoccupied orbitals will be filled before a second electron is

placed in an occupied orbital.

4. State the Pauli exclusion principal.

Electrons in the same orbital have opposing spin.

5. Which is more metallic in character Br or F?

6. How many valence electrons do the following atoms have?

(a) 2e

(b) 1 e

(d) 4e

(e) 8e

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