they are found in all principal energy levels
they are spherical in shape
they can only hold one electron
the maximum number of s orbitals in any principal level is 1

2.  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

3.  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

4.  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

5.  Which one of the following statements about orbitals is incorrect ?

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

6.  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

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

1s²2s⁶
1s²2s²2p⁶
2s²2p⁶
1s²2s²2p⁴

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

1s²
1s²2s²
1s²2s²2p⁶
1s²2s²2p⁶3s²3p⁶

9.  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

10.  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

11.  Which of the following atoms has three unpaired electrons?

B
C
N
O

12.  What is the electronic configuration of a sodium ion Na⁺?

1s²2s²2p⁶
1s²2s²2p⁶3s¹
1s²2s²2p⁶3s²
1s²2s²2p⁶3s²3p⁶4s¹

13.  What is the electronic configuration of an oxide ion O^2-?

1s²2s²2p²
1s²2s²2p⁴
1s²2s²2p⁵
1s²2s²2p⁶

14.  Which one of the following is not isoelectronic with the others?

F^ˉ
Ne
Na⁺
Mg⁺

15.  Which one of the following ions has an electronic configuration similar to argon?

Ti⁺
Ti²⁺
Ti³⁺
Ti⁴⁺

16.  Electrons enter the 4s sub-level before the 3d sub-level because...

there is only one 4s orbital and there are 5 3d orbitals
the 4s orbital is spherical
the 4s orbital has a lower energy
the 3d orbitals have a lower energy

17.  Which of the atom pairs both have only three unpaired electrons in their d orbitals?

Ti and V
Ti and Co
V and Cr
V and Co

18.  Which of the following atoms has the greatest number of unpaired electrons ?

Ti
V
Cr
Mn

19.  Which statement about chromium is incorrect?

chromium is a transition metal
the electronic configuration of chromium atoms is 1s²2s²2p⁶3s²3p⁶4s¹3d⁵
the electronic configuration of chromium atoms is 1s²2s²2p⁶3s²3p⁶4s²3d⁴
chromium has an atomic number of 24

20.  Which statement about copper is incorrect?

the electronic configuration of Cu⁺ is 1s²2s²2p⁶3s²3p⁶3d¹⁰
the electronic configuration of Cu²⁺ is 1s²2s²2p⁶3s²3p⁶3d⁹
the electronic configuration of copper atoms is 1s²2s²2p⁶3s²3p⁶4s¹3d¹⁰
the electronic configuration of copper atoms is 1s²2s²2p⁶3s²3p⁶4s²3d⁹