u3: electron configuration

Question 1

aufbau principle

Answer 1

• electrons are added one at a time to lowest eneryg orbital available

Question 2

how to draw aufbau principle diagram

Answer 2

• 1s^2 to 7s^2
• 2p^6 to 7p^6
• 3d^10 to 6d^10
• 4f^14 to 5f^14
• arrows go down and left

Question 3

how are subshells filled

Answer 3

• in increasing n + l order
• if n + l are same value for to orbitals, fill the one w/ lowest n val first

Question 4

order of subshell filling based on periodic table

Answer 4

• groups 1 to 2 + He are 1s-7s
• group 3 to 12 is 3d-6d
• group 13 to 18 is 2p-7p
• lanthanides/actinides are 4f and 5f

Question 5

hund’s rule

Answer 5

most stable arrangement of electrons in same subshell is when there are the max number of unpaired electrons, all w/ same spin

Question 6

which electron configurations show hunds rule?

Answer 6

• expanded electron configuration and box diagrams
• indicates one electron in each orbital of i.e. 2p