Note
Actual text conversation with my niece:
Her: What is the number of valence electrons in bromine, 35 electrons?
Me: Need to look at table.
Her: It's atomic number is 35..
Me: Find br what element is in top row?
Her: It's in row 17, period 4..
Me: Name top element above br
Her: chlorine(17)
Me: Then 7 right
Her: idk
Her: Oh i get it! Omg!
So there you have it: An actual Eureka! moment.