1. •Electrons in outermost shell have high energy and are less stable
•Energy required to remove the electrons from the outermost shell is less compared to the energy required to remove electrons from the
innermost shell
•The ionization energy keeps on increasing as the electrons are removed – as we move from the outermost to the innermost shell
•Comparatively large amount of energy is required to remove electrons from a stable shell
•Explain the sudden increase in the ionization energies for the electrons highlighted in the table below:
•Explain why noble gaseous have the highest ionization potential?
2. 1. Explain why the first ionization energies of Lithium, Sodium and
Potassium is low?
2. Explain why the noble gases have the highest ionization energies?
4. S orbital can accommodate maximum 2 electrons
P orbital can accommodate maximum 6 electrons
Energy s<p<d<F
• Electrons have wave like properties
• S orbital, p orbital
• S orbital can accommodate maximum 2 electrons
• P orbital can accommodate maximum 6 electrons
• Pauli’s exclusion principle
• Heisenberg uncertainty principle
5. 1s
2s
2p
3s
3p
4s
S orbital 2 electrons
P orbital 6 electrons
Write the electronic
configuration for
Be (4)
Mg(12)
Al (13)
Li (3)
Na(11)
C(6)
0(8)
F(9)
N(5)
Ne(10)
Ar(18)
