Predict the ionization energy of Be3+ given that the ionization energy of He+ is 54.36 eV.

Question

David · Accepted Answer

Problem 1 
The ionization energy of 
  
energy energy
energy
He 4x H where H Ionization energy of hydrogen
54.36
H eV
4
  
 
 
and the ionization energy of   3 2 energy energyBe Z H 9xH
    
54.36
9x 122.31eV
4
 
Problem 2 
The reduced mass of is given by 
' 1 2
HF o
1 2 o
m m 1
m where N Avogadro 's no.
m m N
 

 
Taking   
1
2
m 1.008 gm for H
m 18.998 gm for F


 
Substituting the values , we get  
' 1 2
HF
1 2 o
23
24
m m 1
m
m m N
1.008x18.998 1
gm
1.008 18.998 6.244x10
1.533x10 gm






The moment of inertia HFI  is given by 
' 2
HF HF HF
27 12 2 2
47 2
I m x r
1.533x10 x (120x10 ) kg m
2.

Predict the ionization energy of Be3+ given that the ionization energy of He+ is 54.36 eV.

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