Welcome back to my blog. Here comes the answer to question 36 I posted yesterday. The correct answer is D.
When writing ground state electronic configurations, we have to follow several rules:
1. Aufbau Principle: Electrons fill the lowest energy orbitals first. The order of energy level is: 1s 2s 2p 3s 3p 4s 3d 4p 5s 3d 5p 6s 4f 5d 6p 7s 5f 6d 7p .....
2. Pauli Exclusion Principle: In a given atom, no two electrons can have the same set of 4 quantum number. This rule determined that each orbital can hold only two electrons.
3. Hund Rule: —The lowest energy state of an atom is the one having the max numbers of unpaired electrons. When electrons are filling degenerate orbitals, they tend to occupy all the orbitals first and then pair up if they have to.
No Now we see, The electron configuration of the atoms are:
According to the Hund Rule, if a sublevel is not fully filled, electrons tend to occupy all the orbitals with the same energy level first and then pair up if necessary. Li has 1, B has 1, Sc has 1, V has 3 and Ni has 2 unpaired electrons respectively.
Following is Question 37 of the series.
37. What is the net ionic equation for the reaction that occurs when aqueous solutions of HOCl, a weak acid, and calcium hydroxide, Ca(OH)2, are combined?
I will post the answer and explanation tomorrow.
Thank you very much for reading my post, I am available to discuss any topics in AP chemistry. Please give me a call at 604-808-6827 or email me at vancouverchemistrytutor@gmail.com. My website is located at www.vancouverchemistrytutor.com.
Regards!
No comments:
Post a Comment