WASSCE CHEMISTRY MAY/JUNE  2009 (SSCE WAEC MAY/JUNE 2009 CHEMISTRY)

1. Which of the following scientists discovered the neutron?

A. Ernest Rutherford

B. J.J Thompson

C. James Chadwick

D.R.A Milliakan

 

2. How many protons does $_{20}^{40}Ca$ contain?

A. 20

B.30

C. 40

D. 60

 

WASSCE JUNE 2008

1. The mass spectrometer can be used to measure mass of

A. atom

B. an electron

C. a proton

D. neutron

 

2. Find the number of neutrons in an atom represented by $_{21}^{45}X$

A. 21

B.24

C. 45

D. 66

 

3. The valence electrons in a chloride ion are [₁₇Cl]

A. 2p electrons only

B. 3s and 3p electrons only

C. 3p and 3d electrons only

D. 3p electrons only