Chemistry · Periodic trends in properties of elements: atomic and ionic radii, ionization enthalpy, electron gain enthalpy, valence, oxidation states and chemical reactivity
The set representing the correct order of first ionisation potential is :
The set representing the correct order of first ionisation potential is :
- A. \( K>N a>L i \)
- B. \( B e>M g>C a \)
- C. \( B>C>N \)
- D. \( G e>S i>C \)
Step-by-step solution
Ionization potential decreases down a group and increases across a period. For Group 2 elements, the order of first ionization potential is Be > Mg > Ca because atomic size increases down the group, making it easier to remove an electron. Options A, C, and D violate these trends: A (decreasing down Group 1), C (increasing across Period 2), D (decreasing down Group 14).
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