Electronic Configuration Multiple Choice Quiz
1. Which one of the following statements about s orbitals is incorrect ?
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 O2-?
1s22s22p2
1s22s22p4
1s22s22p5
1s22s22p6
14. Which one of the following is not isoelectronic with the others?
Fˉ
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
http://www.knockhardy.org.uk/sci_htm_files/mceconf.HTM
Answers
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
C
D
D
B
C
C
D
B
C
D
C
A
D
D
D
C
D
C
C
C