Understanding Electron Configurations

This video tutorial by Dr. B explains how to use the diagonal rule to write electron configurations for elements on the periodic table. It provides step-by-step examples for sodium, calcium, and chlorine, demonstrating how to distribute electrons around the nucleus. The video also includes a diagram of the diagonal rule and offers additional resources for using the periodic table and understanding ions.

What is the purpose of the diagonal rule in electron configurations?

• To help write electron configurations for elements

• To determine the number of protons in an atom

• To find the atomic mass of an element

• To calculate the number of neutrons in an atom

How many electrons can the 's' orbital hold?

• 6

• 1

• 2

• 4

What is the electron configuration for sodium?

• 1s² 2s² 2p⁴ 3s²

• 1s² 2s² 2p⁶ 3d¹

• 1s² 2s² 2p⁶ 3p¹

• 1s² 2s² 2p⁶ 3s¹

How many electrons does calcium have in its electron configuration?

• 24

• 22

• 20

• 18

What is the significance of the diagonal rule diagram?

• It shows the order of filling electron orbitals

• It calculates the atomic number

• It predicts chemical reactions

• It determines the element's state of matter

What is the total number of electrons in chlorine's electron configuration?

• 18

• 16

• 17

• 15

Where can you find additional resources on electron configurations?

• In the appendix

• In the video description

• On the periodic table

• In the textbook