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| 1. | What ia sodium ????????? | 
| Answer» Explanation:Sodium is a chemical element with the symbol Na and atomic number 11. It is a SOFT, silvery-white, highly reactive METAL. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable ISOTOPE is ²³Na. The free metal does not occur in NATURE, and must be prepared from compounds. Symbol: NaSymbol: NaAtomic mass: 22.989769 uSymbol: NaAtomic mass: 22.989769 uAtomic number: 11Symbol: NaAtomic mass: 22.989769 uAtomic number: 11Electron configuration: [Ne] 3s¹Symbol: NaAtomic mass: 22.989769 uAtomic number: 11Electron configuration: [Ne] 3s¹Van der WAALS radius: 227 pmSymbol: NaAtomic mass: 22.989769 uAtomic number: 11Electron configuration: [Ne] 3s¹Van der Waals radius: 227 pmMelting point: 97.79 °CSymbol: NaAtomic mass: 22.989769 uAtomic number: 11Electron configuration: [Ne] 3s¹Van der Waals radius: 227 pmMelting point: 97.79 °CCAS ID: 7440-23-5 | |