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NTA Abhyas JEE Main2020ChemistryClassification of Elements and Periodicity in PropertiesPractice

The set representing the correct order of ionic radius is

Options

  1. AL i + > B e 2 + > N a + > M g 2 +
  2. BN a + > L i + > M g 2 + > B e 2 +
  3. CL i + > N a + > M g 2 + > B e 2 +
  4. DM g 2 + > B e 2 + > L i + > N a +

Correct answer

B. N a + > L i + > M g 2 + > B e 2 +

Step-by-step solution

In general the ionic radius increases on moving from top to bottom in group and decreases on moving from left to right in period. So, Na + > Li + and Mg 2+ > Be 2+ . The size of Mg 2+ is however smaller than Li + . Despite the Mg atom having a slightly larger atomic size, the Mg 2+ ion is marginally smaller in size than the Li + ion because of its higher nuclear charge Hence, the correct trend is N a 0.98 Å + > L i 0.68 Å + > M g 0.65 Å 2 + > B e 0.62 Å 2 +

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