Beryllium (Be) - Element 4 | Properties & Electron Configuration

Electron Configuration

The full electron configuration of Beryllium is 1s² 2s². In noble gas shorthand, this is written as [He] 2s².

Beryllium is a s-block element in group 2, period 2.

Periodic Trends

Electronegativity: Beryllium has a Pauling electronegativity of 1.57. Within group 2, electronegativity generally decreases down the group.

Atomic Radius: 105 pm. Across period 2, atomic radius generally decreases left to right as nuclear charge increases.

Ionization Energy: 900 kJ/mol. Ionization energy generally increases across a period and decreases down a group.

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