Why electron gain enthalpy of beryllum and magesium are positive?
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Beryllium and magnesium are pf very small size. So if we ad an electron , it will experience repulsion by the electrons in the orbitals. Thus beryllium and magnesium have to provide energy to the extra electron to increase the bond length and ultimately decrease the repulsion.
As beryllium and magnesium are providing energy hence their electron gain enthalpy is positive.
As beryllium and magnesium are providing energy hence their electron gain enthalpy is positive.
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hi ,
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Electron gain enthalpy is the energy required to add an electron to the isolated gaseous atoms of element, and for Be and Mg it is positive unlike electronegative atoms, which have negative Electron gain enthalpy . This is all because Be and Mg are electropositive elements and addition of an electron will cause an unstability to the atom, hence they will oppose the addition of electron to it , so large amount of energy is required.
ans. -
Electron gain enthalpy is the energy required to add an electron to the isolated gaseous atoms of element, and for Be and Mg it is positive unlike electronegative atoms, which have negative Electron gain enthalpy . This is all because Be and Mg are electropositive elements and addition of an electron will cause an unstability to the atom, hence they will oppose the addition of electron to it , so large amount of energy is required.
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