The statement that an electron occupies the lowest available energy orbital is

• Hund's Rule

• AUfbau principle

• Bohr's law

• The Pauli Exclusion principle

"Orbitals of equal energy are each occupied by one electron before any is occupied by a second electron, and all electrons in singly occupied orbitals must have the same spin" is a statement of

• Hunds rule

• The Pauli exclusion Principe

• Aufbau principle

• The quantum effect

The statement that no two electrons in the same atom can have the same four quantum numbers is

• Hunds rule

• the Pauli exclusion principle.

• Aufbau Principle

• Bohr's law

Which of the following rules requires that each of the p orbitals at a particular energy level receive one electron before any of them can have two electrons?

• the Pauli exclusion principle

• Aufbau principle

• Hund's rule

• The quantum rule

Two electrons in the 1s orbital must have different spin quantum numbers to satisfy

• Aufbau Principle

• Hund's rule

• the Pauli exclusion principle.

• quantum rule

The sequence in which energy sublevels are filled is specified by

• the Pauli exclusion principle.

• Aufbau principle

• Orbital's rule

• Lyman's series.

The atomic sublevel with the next highest energy after 4p is

• 4d

• 4f

• 5s

• 5p

In the electron configuration for scandium (atomic number 21), what is the notation for the three highest-energy electrons?

• 4s2, 3d1

• 3d3

• 4s3

• 4s2 4p1