Why are BEH2 and MGH2 covalent in nature
Answers
According to Fajan’s Rule, Covalent character usually comes from having a cation that is very small reacting with a relatively large anion. When you have a small highly charged cation you can say that the ion has “polarizing power”. Polarizing power comes from the ratio between the size charge and radius being correct. If a cation has a high polarizing power it “pulls” the large electron clouds from the anion forming a bond that is at least partially covalent.
As far as MgH2 and BeH2 are concerned. Mg and Be is a small relatively high charged ion and the H- ion is very large anion. So you will end up with something that has some covalent character.
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It all depends on the difference of electronegativities of elements in a compound. The convention (not an absolute rule that one can derive) is that if the EN difference is greater than 1.7, the compound is ionic; if less covalent. ... Therefore, one can describe both, BeH2 and MgH2 as partly ionic compounds.