1. What is the total number of principal energy levels or shells in an atom with an atomic number of 30?
I choose b.
2. The electron configuration of an atom in the ground state is 2-4. The total number of occupied principal energy levels in this atom is
I choose b.
I don't know what 2-4 or 2-7 means. If it means 2 electrons in n = 1 and 4 in n = 2, then b is correct.
3. In an atom that has an electron configuration of 2-7, what is the total number of electrons in its principal energy level of highest energy?
I choose a.
a is correct if that means 2 electrons in n = 1 and 7 in n = 2.
21. What is the total number of occupied principal energy levels in an atom of 11Na?
I choose c.
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