Why d block elements have more covalent character than alkali and alkaline earth metals

this m asking

in licl and becl2 although li has small size than be then also it is ionic because there are 2 big chlorine atoms in becl2 in which there is more distortion m right?

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For d block element outer orbital is d orbital which has poor shielding effect meaning effect of nucleus will be more outer eletron which will result in overlapping of orbital (ele...