Teacher:You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
Teacher: Now, understand the problem? Solve this instance: n=3 means that there are s, p, and d shells involved. The s shell can accomidate 2 electrons, the p, 6 and the d, 10, so a total of 18 electrons can be accommodated, so that's 9 pairs of electrons.
Student:
How many electron pairs with principal quantum number n=3 can be accomodated in an atom?