Complete the two filling rules

Exercise and reference answers

Missing parts

1. Answer

   Pauli exclusion

   Choices

   1. Pauli exclusion
   2. Heisenberg
   3. Aufbau

2. Answer

   Hund's

   Choices

   1. Hund's
   2. Bohr's
   3. Dalton's

3. Answer

   singly

   Choices

   1. singly
   2. doubly
   3. never

Complete the statement

The {0} principle says no two electrons in an atom may share the same set of four quantum numbers. {1} rule says pairing does not begin until every orbital of the subshell is {2} occupied.

Explanation