Question

The systematic arrangement of electrons in various atomic orbitals in the increasing order of their ener-
gies is known as electronic configuration.
The filling of electrons into the orbirtals of different atoms takes place according to the aufbau principle,
the pauli’s exculsing principle, the Hund's rule of maximum multiplicity and the relative energies of the
orbitals.
[Ar] = 1s 2s2p 3s 3p
[ Kr] = 1s 2s? 2p 3s 3p% 482 3dº 4p6
The electronic configuration of Se is
[]
a) [Ar] 4s2 3d tº 4p? b) [Ar] 4s? 3dl0 4p c) [Ar] 4s 3d1° 4p d) [Ar] 4s 3d 4p
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Answer 1

Selenium- (Ar) 1s2 2s2 2p6 3s2 3p2.

Answer 2

Answer:

gies is known as electronic configuration.

The filling of electrons into the orbirtals of different atoms takes place according to the aufbau principle,

the pauli’s exculsing principle, the Hund's rule of maximum multiplicity and the relative energies of the

orbitals.

[Ar] = 1s 2s2p 3s 3p

[ Kr] = 1s 2s? 2p 3s 3p% 482 3dº 4p6

The electronic configuration of Se is

[]

a) [Ar] 4s2 3d tº 4p? b) [Ar] 4s? 3dl0 4p c) [Ar] 4s 3d1° 4p d) [Ar] 4s 3d 4p

Test yourself (Organic Tips)