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Beryllium
Atomic Number: 4 
Atomic mass: 9.01218
Melting point: 1280 °C
Boiling point: 2970 °C
Electronegativity: 1.5
discoverer: Abbé René-Just Hauy

Atom model

Description: 

Beryllium is a toxic element, it is steel grey color, strong and light weight, it has one of the highest melting points of the light metals.

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