Although the value of second ionisation potential of alkaline earth metals is higher than that of 1st ionisation potential yet these metals form M^"+2" ions but no M^+ ion?
1 Answer
All alkaline earth metals can form
"M"(g) + DeltaH_(IE1) -> "M"^(+)(g) + e^(-)
"M"^(+)(g) + DeltaH_(IE2) -> "M"^(2+)(g) + e^(-)
Here's a list of first and second ionization energies from NIST (simply search the chemical symbol of the atom):
"Mg" : likes to form"Mg"^(2+)
DeltaH_(IE1) = "7.646 eV"
DeltaH_(IE2) = "15.035 eV"
"Ca" : likes to form"Ca"^(2+)
DeltaH_(IE1) = "6.113 eV"
DeltaH_(IE2) = "11.872 eV"
"Sr" : likes to form"Sr"^(2+)
DeltaH_(IE1) = "5.695 eV"
DeltaH_(IE2) = "11.030 eV"
"Ba" : likes to form"Ba"^(2+)
DeltaH_(IE1) = "5.212 eV"
DeltaH_(IE2) = "10.004 eV"
If you supply the exact energy, I see no reason why one cannot form the
For instance, there is such a thing as lead monofluoride,