Among alkaline earth metals the element farming predominantly covalent compound is
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Beryllium is the exception, and it often forms covalent bonds.
1.Because of small size.
2.High ionization energy.
This is because they have their last electrons in 2Sorbital which is nearest to the nucleus compared to other members. Vicinity with the nucleus leads to higher effective nuclear charge or stronger attraction from the nucleus and thus makes the removal of their electrons difficult. This leads to bit higher ionization enthalpy and bit lesser ionic character.
3.Relatively higher electonegativity.
1.Because of small size.
2.High ionization energy.
This is because they have their last electrons in 2Sorbital which is nearest to the nucleus compared to other members. Vicinity with the nucleus leads to higher effective nuclear charge or stronger attraction from the nucleus and thus makes the removal of their electrons difficult. This leads to bit higher ionization enthalpy and bit lesser ionic character.
3.Relatively higher electonegativity.
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