Question

Explain Hund's rule of maximum multiplicity by taking an example of phosphorous.

Answer 1

according to Hund's rule, if two orbits of same energy levels are available then electrons will fill the orbits first singly then in pairs. 

As in phosphorous, 3s²3pₓ¹ 3py¹ 3p¹z

Answer 2

Explanation of Hund's rule of maximum multiplicity for phosphorous.

Explanation:

Hund's rule of maximum multiplicity

• The Hund's rule of maximum multiplicity states that "pairing of electron takes place only when the orbital's are degenerate and orbital's are filled with one electron each".
• The sub energy level 'P' has three orbitals namely $P_x, P_y,andP_z$.
• In these orbitals, the electrons are filled in such a way that each orbital gets one electron followed by the pairing.

Hund's rule of maximum multiplicity for phosphorous.

• The atomic number of phosphorous is 15 and its electronic configuration is $1s^22s^22p^63s^23p^3$.
• In it, the 1s, 3s and 2s orbitals get 2 electrons each. On the other hand, the 2p orbital gets 6 electrons.
• When the 3p orbital is taken, in it as there are only three electrons available, each sub energy level gains one electrons each.
• The mechanism is given in the attachment.

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