QQuestion
What is meant by ionisation energy of an atom of an element? Arrange Na, Rb, Li and Cs in the increasing order of their ionisation energy.
OR
The atomic numbers of the elements ‘A’, ‘B’ and ‘C’ are (n-2), n, (n+1) respectively, ‘B’ is an inert gas. In which group of the Periodic Table are ‘A’ and ‘C’ located? Which one among them has the highest reductive power? What is the formula of the compound produced by combining ‘A’ and ‘C’?
✓Answer
Ionisation energy is the amount of energy required to remove an electron from an isolated atom in the gaseous state.
Rb < Cs < Na < Li
OR
Group of A and C:
- A (atomic number n-2) is in Group 1 (alkali metals).
- C (atomic number n+1) is in Group 17 (halogens).
Highest Reductive Power:
- A (an alkali metal) has the highest reductive power.
Formula of the Compound:
- The formula of the compound formed between A (Group 1) and C (Group 17) will be AC, such as NaCl, LiCl, etc.
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