Q35Multiple choice
12 81
- (a)17 Cl
- (b)6 C
- (c)35 Br Table 4.1 Element np nn STRUCTURE OF THE ATOM 31 16-04-2018 33. Helium atom has 2 electrons in its valence shell but its valency is not 2, Explain. 34. 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 ———. 35. An element X has a mass number 4 and atomic number 2. Write the valency of this element?
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Valency is zero as K shell is completely filled. Long Answer Questions