why is the bond in BeCl2 a covalent and not ionic
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Be (Beryllium) does not form cations because it has a high electronegativity, meaning it attracts a bonding pair of electrons towards itself very strongly.
In order for an ionic bond to form, it has to let go of its electrons.
However, it's too electronegative to do that. It's very small too, therefore, with its high charge density and high electronegativity, it is basically impossible for Be+2 (Beryllium) to form an ionic bond.
In the end, Beryllium and Chlorine decide to share the electrons, forming a covalent bond (this process is called polarization).
Explanation:
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