for Peter

1. openfirst
https://www.austincc.edu/mohan/documents/Ch07_Outline_000.pdf
alkali metals
Lithium,Sodium,Potassiumreactwithwater
https://www.youtube.com/watch?v=QQF61CFOySw
Alkaline metals
Group 2 - Alkaline EarthMetals| Propertiesof Matter| Chemistry|FuseSchool
https://www.youtube.com/watch?v=8qh5myTmcRs
The PeriodicTable:CrashCourse Chemistry#4
https://www.youtube.com/watch?v=0RRVV4Diomg
EnergyLevels,Energy Sublevels,Orbitals,&Pauli ExclusionPrinciple
https://www.youtube.com/watch?v=J-DjEIlynjE
6:05 / 6:28
Metalsand NonmetalsandMetalloids
https://www.youtube.com/watch?v=lEjB0isifP0