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Diagram representing the arrangement of orbitals in order of their increasing energies are called energy level diagrams.
Important observations from energy level diagrams of multi electron atoms are:
1)The sub shell of a particular shell do not have equal energies.For Ex: 2s and 2p have different energies.
2)In a particular shell, sub shell with lower value of l has lower energy. In the second shell, 2s ( l=0) has lower energy than 2p ( l=1) .In the 3rd shell, energies are in the order: 3s < 3p < 3d.
In the 4th shells, they are in the order of 4s <4p< 4d< 4f.
3)For the same value of n, the differences between energies of s and p sub shell is small whereas between p and d sub shell, it is large and so on.
4)As the value of n increases ,the sub shell of lower shell may have higher energy than that of a higher shell, 3d has higher energy than 4s.
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Billie Jean King (née Moffitt; born November 22, 1943) is an American former World No. 1 professional lawn tennis player. King won 39 Grand Slam titles: 12 in singles, 16 in women's doubles, and 11 in mixed doubles. King is an advocate for gender equality and has long been a pioneer for equality and social justice.
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