Chemistry-
General
Easy

Question

Ionisation energy in group I-A varies in the decreasing order as

  1. (a) L i greater than N a greater than K greater than C s  
  2. N a greater than L i greater than K greater than C s  
  3. (c) L i greater than C s greater than K greater than N a  
  4. K greater than C s greater than N a greater than L i  

The correct answer is: (a) L i greater than N a greater than K greater than C s


    Due to the large size of group IA elements, the outermost electron is far from the nucleus and can easily be removed. their ionisation energies or ionisation potentials are relatively low. Li Na K Rb Cs
    Ionisation potential (eV) 5.4 5.1 4.3 4.2 3.9

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