https://byjus.com/chemistry/valence-electrons/#:~:text=For%20neutral%20atoms%2C%20the%20number,and%20has%206%20valence%20electrons
Helmenstine, Anne. The Difference Between an Element Family and an Element Group
https://www.chemistrylearner.com/bohr-model.html
What is Bohr Model
https://byjus.com/chemistry/valence-electrons/#:~:text=For%20neutral%20atoms%2C%20the%20number,and%20has%206%20valence%20electrons
Valence Electrons
https://cms-media.bartleby.com/wp-content/uploads/sites/5/2024/01/12075747/pasted-image-0-30.png
Periodic Table
https://media.letstalkscience.ca/m/fea95c896bbfaa1/webimage-2024_Original_CalciumPeriodicTable_EN_ResourceBody.png
Element Symbol
