Question

3. The sum of the first three ionization energies of the lanthanoides Ce, Eu, Gd, Yb, Lu is
1) Ce > Eu > Gd > Yb > Lu
2) Yb > Lu > Eu > Gd > Ce
3) Yb > Eu > Lu > Gd > Ce
4) Yb > Eu > Gd > Lu> Ce
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Answer 1

Answer:

ce = chemical energ

Eu = Energy effciency

yb = ytterbium

lu = lutetium