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| Appearance | | Appearance | ||
| | |greenish yellow <br> [[image:Sample potassium.jpg|150px]] | ||
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| [[Periodic table group|Group]], [[Periodic table period|Period]], [[Periodic table block|Block]] | | [[Periodic table group|Group]], [[Periodic table period|Period]], [[Periodic table block|Block]] | ||
| 17,3,p | | 17,3,p | ||
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| [[Electron configuration]] | | [[Electron configuration]] | ||
| [Ne]3s<sup>2</sup>3p<sup>5</sup>, | | [Ne]3s<sup>2</sup>3p<sup>5</sup>, | ||
|- | |- | ||
| [[Electron shell|Electrons per shell]] | | [[Electron shell|Electrons per shell]] | ||
| 2,8,7 <br> [[image:Electron shell Chlorine.png|150px]] | | 2,8,7 <br> [[image:Electron shell Chlorine.png|150px]] | ||
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| [[CAS registry number|CAS number]] | | [[CAS registry number|CAS number]] |