Radio,Television And Electronic Paper 2, WASSCE (SC), 2017

Question 2

 

  1. Fig. 1 is an atomic structure.

  1. Identify the parts labeled L and M.
  2. State one property of the atom as determined by L.
  3. Name the particles contained in M.

 

  1. Fig. 2 shows two particles attracting each other.


State the:

  1. charges possessed by each of particles P and Q.
  2. effect of taking Q far away from P.
  3. illustrate with the aid of a diagram, the effect of replacing Q with another P in Fig. 2.

 

Observation

The expected answers were:

  (a) (i) L – Electron
M – Nucleus                                           
(ii) Properties of the atom determined by L

  • It is an atom of a metal/conductor
  • It is a good conductor of electricity and heat.
  • It has one valence electron

                                                                        
(iii) Proton and neutron                                                                                          
(b) (i) P –positive charge (or +);    
Q – negative charge ( or - )                                            
(ii) No/weak attraction                                                                                           
(c) Diagram of effect of replacing Q with another P

Majority of the candidates that attempted this question responded well.