How many subshells are there with n = 4 in an atom?

Consider the following descriptions of quantum numbers:

A: energy level within a subshell

B: shape of orbital

C: spin of electron

D: energy level

Which of the following is the correct pairing of quantum numbers (1st, 2nd, 3rd, and 4th) with the given descriptions?

What can be concluded about the quantum numbers for potassium and potassium ion?

Which of the following set of quantum numbers is not valid?

Which of the following sets of quantum numbers () could correspond to a orbital?

Which of the following is/are true regarding the principal quantum number?

I. Principal quantum number signifies the energy level

II. Principal quantum number can never equal zero

III. Principal quantum number can be positive or negative

Which of the following is true regarding ethene? (The electrons in answer choices refer to carbon electrons)

Which of the following sets of quantum numbers could correspond to a orbital?