Waec Chemistry Past Questions For Year 2008
Question 1
What is the atomic number of an element whose cation Y+ has the electronic configuration 1s22s22p6?
- A. 9
- B. 10
- C. 11
- D. 12
Question 2
The valence electrons in a chloride ion are [17CI]
- A. 2p electrons only
- B. 3s and 3p electrons only
- C. 3p and 3d electrons only
- D. 3p electrons only
Question 3
Find the number of neutrons in an atom represented by 4521X.
- A. 21
- B. 24
- C. 45
- D. 66
Question 4
The mass spectrometer can be used to measure mass of
- A. an atom
- B. an electron
- C. a proton
- D. a neutron
Question 5
Arrange the following elements in order of increasing electron affinity: Br2CI2
I 2
F 2
- A. I 2CI2Br2F 2
- B. I 2Br2CI2F 2
- C. CI2 I 2Br2F 2
- D. Br2CI2 I 2 F 2
