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3D Bohr-model representation of the Lithium atom (symbol Li, atomic number Z=3). Electron shell configuration: 2, 1 electrons.
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Bohr model · educational
Related lesson
First look at the periodic classification
Reading the table, spotting families (alkali metals, halogens, noble gases). Why some elements share properties.
9 minElectron configuration
Full1s² 2s¹
Short[He] 2s¹
Valence electrons1
KLMNOPQ shells
K2
L1
Electronegativity
Pauling0.98
Allen0.912
Mulliken (eV)—
Atomic radii
Empirical145 pm
Calculated167 pm
Covalent128 pm
Van der Waals182 pm
Ionic radii (Shannon-Prewitt)
+176 pm
Successive ionisation energies
I₁520.2 kJ/mol
I₂7298.1 kJ/mol
I₃11815 kJ/mol
Electron affinity59.6 kJ/mol
Oxidation states
+1
Bold states = most common.