## Homework 1E.13

bonnie_schmitz_1F
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### Homework 1E.13

As I was going through this problem, I realized once I got to the fourth energy level, I was unsure when to add 4f. For example, Sb goes from 4d10 to 5s2, but then W goes 4f14, 5d4, 6s2. Could someone explain when you should include the f orbital?

Rachel Yoo 1F
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

### Re: Homework 1E.13

The f orbital is included after the 6s2 orbital is filled. When looking at the periodic table, you can see that the f block starts in period 6.