PRELIM EXAM

Which one of the following statements about p orbitals is incorrect?

• they are found in all principal energy levels

• they have a dumb-bell shape

• there are three types of p orbital

• each p orbital can hold up to two electrons

Which one of the following statements about d orbitals is incorrect?

• they are not found in the first two principal energy levels

• they are associated with transition elements

• there are 5 types of d orbital

• d orbitals are filled before p orbitals in the same principal energy level

The Aufbau Principle states that...?

• only two electrons can occupy an orbital

• electrons enter the lowest available energy level

• electrons remain unpaired if possible

• orbitals are regions in space where one is likely to find an electron

orbitals are regions in space where one is likely to find an electron

• orbitals can hold up to two electrons

• orbitals are regions in space where one is likely to find an electron

• orbitals can hold two electrons provided they are spinning in the same direction

• s, p, d and f orbitals are possible

Which one of the following statements is correct?

• the 3d sub level is filled before the 4s sub level

• the 3rd principal energy level only contains 8 electrons

• principal energy levels get closer together as they get further from the nucleus

• orbitals are always filled in numerical order

The electronic configuration of an atom an element with atomic number 8 is...

• 1s2, 2s6

• 1s2, 2s2, 2p6

• 2s2, 2p6

• 1s2, 2s2, 2p4

Which one of the following is not the electronic configuration of atom of a noble gas?

• 1s2

• 1s2, 2s2

• 1s2, 2s2, 2p6

• 1s2, 2s2, 2p6, 3s2, 3p6

The order of filling orbitals is...

• 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p

• 1s, 2s, 2p, 3s, 3p, 3d, 4p, 3d

• 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p

• 4p, 4s, 3d, 3p, 3s, 2p, 2s, 1s

Hund's Rule states that...

• you must not sit next to another person on a bus

• electrons enter the lowest available energy level

• an orbital can hold up to two electrons

• electrons in similar energy orbitals remain unpaired as far as possible

Which of the following atoms has three unpaired electrons?

• B

• C

• N

• O