11 Na 22.99
Sodium
alkali metal
Properties
- Atomic number
- 11
- Atomic mass
- 22.99 u
- Category
- alkali metal
- Group
- 1
- Period
- 3
- Block
- s-block
- State (room temp)
- Solid
- Outer-shell electrons
- 1
- Electronegativity
- 0.93 (Pauling)
- Density
- 0.968 g/cm³
- Melting point
- 97.79 °C
- Boiling point
- 882.94 °C
Electron configuration
1s² 2s² 2p⁶ 3s¹
Noble-gas shorthand: [Ne] 3s¹
Electrons per shell: 2, 8, 1, which is 1 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Sodium
Sodium /ˈsoʊdiəm/ is a chemical element with symbol Na (from Ancient Greek Νάτριο) and atomic number 11. It is a soft, silver-white, highly reactive metal. In the Periodic table it is in column 1 (alkali metals), and shares with the other six elements in that column that it has a single electron in its outer shell, which it readily donates, creating a positively charged atom - a cation.
- Discovered by Humphry Davy
- Appearance: silvery white metallic
Sodium: frequently asked questions
- What is Sodium?
- Sodium (Na) is the chemical element with atomic number 11. It is a metal: specifically an alkali metal.
- What is the atomic number of Sodium?
- Sodium's atomic number is 11, which means every Sodium atom has 11 protons in its nucleus.
- What is the electron configuration of Sodium?
- The electron configuration of Sodium is 1s2 2s2 2p6 3s1 (noble-gas shorthand: [Ne] 3s1). Its electrons are arranged in shells of 2, 8, 1, with 1 in the outermost shell.
- Is Sodium a metal or a nonmetal?
- Sodium is a metal: specifically an alkali metal.
- What group and period is Sodium in?
- Sodium is in group 1 and period 3 of the periodic table.
- Is Sodium a solid, liquid, or gas?
- At room temperature, Sodium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.