Electron Configuration and Orbital Notation

Mr. Kazi provides a tutorial on writing electron configurations and orbital notations for arsenic. He explains the use of the periodic table to determine electron configurations, emphasizing the importance of energy levels and orbital blocks. The video covers Hund's Rule and the correct order of filling orbitals, with a focus on arsenic's 33 electrons. The tutorial concludes with a recap of the steps and an invitation to contact Mr. Kazi for further questions.

Why is a periodic table essential for writing electron configurations?

• It displays the melting points of elements.

• It lists the isotopes of each element.

• It shows the chemical properties of elements.

• It provides the atomic number and electron count.

What is the atomic number of arsenic?

• 15

• 33

• 50

• 75

Which orbital is filled first in the electron configuration of arsenic?

• 3d

• 4s

• 4p

• 3p

What is the correct electron configuration for arsenic?

• 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3

• 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3

• 1s2 2s2 2p6 3s2 3p6 4s2 4p3 3d10

• 1s2 2s2 2p6 3s2 3p6 4p3 4s2 3d10

What rule must be followed when filling orbitals in orbital notation?

• Pauli Exclusion Principle

• Hund's Rule

• Aufbau Principle

• Heisenberg Uncertainty Principle

In orbital notation, what do the arrows represent?

• The type of orbital

• The number of protons

• The direction of electron spin

• The energy levels of electrons

According to Hund's Rule, how should electrons be distributed in orbitals?

• Electrons should be distributed randomly.

• Electrons should fill the lowest energy orbital first.

• Each orbital should have one electron before any pairing occurs.

• All electrons should pair up in the first orbital.

What is the significance of the 4s orbital filling before the 3d orbital?

• 4s can hold more electrons than 3d.

• 4s has a higher energy level than 3d.

• 4s is closer to the nucleus than 3d.

• 4s has a lower energy level than 3d.

What should you do if you have questions about electron configurations?

• Consult a chemistry textbook.

• Email Mr. Kazi for clarification.

• Search online for answers.

• Ask a classmate for help.

What is the final step in determining the electron configuration and orbital notation?

• Determine the element's reactivity.

• Calculate the atomic mass.

• Write the electron configuration and orbital notation.

• Memorize the periodic table.