1) How many orbitals are on the third principal energy level? a) 2 b) 3 c) 6 d) 9 2) Which of the following postulates explain that no two electrons can have the same set of four quantum numbers? a) Hund’s Rule b) Dalton’s Atomic Theory c) Pauli’s Exclusion Principle d) Aufbau principle 3) Which among the following shows that an atom is stable? a) With 6 valence electrons b) With 10 valence electrons c) With 12 valence electrons d) With 8 valence electrons 4) Which explains the filling up of the orbital in the order of increasing energy? a) Octet Rule b) Hund’s Rule c) Pauli’s Exclusion d) Aufbau Principle 5) Which orbital designation has the highest energy? a) 2s b) 2p c) 3d d) 4s 6) Which of the following is the lowest value of that the principal quantum number may have? a) 0 b) 1 c) 2 d) 3

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