Aufbau Principle: Building Electron Configurations

The video tutorial explains the concept of ground state in atoms, where electrons fill orbitals of lowest energy first. It introduces the order of orbital energy and the filling sequence, using Euler's and modulus diagrams to illustrate the process. The N plus L rule is discussed, explaining how electrons fill orbitals with lower N plus L values first. The tutorial compares orbital energies based on N and L values, emphasizing the priority of lower energy orbitals in electron filling.

What does the Aufbau principle state about electron filling in orbitals?

• Electrons fill orbitals randomly.

• Electrons fill orbitals based on atomic number.

• Electrons fill orbitals in order of decreasing energy.

• Electrons fill orbitals in order of increasing energy.

Which orbital has the lowest energy according to the order of filling?

• 2S orbital

• 3D orbital

• 1S orbital

• 4F orbital

What does the N plus L rule help determine?

• The number of electrons in an atom

• The atomic mass of an element

• The order of electron filling in orbitals

• The shape of the orbitals

In the N plus L rule, what does 'N' represent?

• Azimuthal quantum number

• Principal quantum number

• Magnetic quantum number

• Spin quantum number

If two orbitals have the same N plus L value, which orbital will electrons fill first?

• The one with the lower N value

• The one with the lower L value

• The one with the higher N value

• The one with the higher L value

Which orbital will electrons fill first: 2P or 3S?

• Neither, they fill 4F first

• Both at the same time

• 2P orbital

• 3S orbital

What is the N plus L value for a 2P orbital?

• 2

• 3

• 4

• 5