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Fill in the blanks in the following statements 

(a) Rutherford’s α-particle scattering experiment led to the discovery of the ——— 

(b) Isotopes have same ———but different———. 

(c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be———and———respectively. 

(d) The electronic configuration of silicon is ———and that of sulphur is ———.

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(a) atomic nucleus 

(b) atomic number, mass number 

(c) 0 and 1. 

(d) Silicon—2, 8, 4 

      Sulphur— 2, 8, 6

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