Here in this example question it says which of the following is a possible value for a principal quantum number shell. So here we have N equals -3, negative 4011 and -7. Remember we said that your principal quantum number north is connected to the periods or rows of the periodic table. The smallest. Value we can have a row is 1.
And we said that the periodic table is dynamic. It's always increasing. Right now we have 7 rows, but in the future we're going to we're going to have 8910 rows. It can continue onward. So here theoretically N equals any value from one to Infinity. That means all these negative values would not work, and N cannot equal 0 has to start off as one as a possible value.
So the answer here would have to be option D Theoretically N can equal 11.