Click Check. What is the electron configuration of hydrogen?

1. Click Check. What is the electron configuration of hydrogen?
2. Actions: Click Next element to select helium. Add another electron to the 1s orbital. The arrows represent the spin of the electron. What do you notice about the arrows?
3. The Pauli exclusion principle states that electrons sharing an orbital have opposite spins.
4. Check your work. Click Check. What is the electron configuration of helium?
5. Actions: Click Next element and create electron configuration for lithium, beryllium, and boron. Click Check to check your work, and then list each configuration below:
Lithium: ________
Beryllium: ________
Boron: ________
6. Actions: Click Next element to select carbon. Add a second electron to the first 2p orbital. Click Check. What feedback is given?
7. Remember: Hund's rule states that electrons will occupy an empty orbital when it is available in the same subshell. Rearrange the electrons in the 2p sublevel and click Check.
Show the correct configuration in the boxes at right.
2p: ___ ___ ___
1s: ___
2s: ___