Given below are two statements:
Statement I: is the correct order in terms of metallic character.
Statement II: Atomic radius is always greater than the ionic radius for any element.
In the light of the above statements, choose the correct answer from the options given below:
Statement I is false but Statement II is true
Statement I is true but Statement II is false
Both Statement I and Statement II are false
Both Statement I and Statement II are true
Correct answer:B
Standard Method
Given: Two statements about metallic character and atomic radius versus ionic radius.
Find: Which statement is true or false, and hence identify the correct option.
Step 1: Analysis of Statement I Metallic character increases down a group and decreases from left to right across a period. Potassium is the most metallic, followed by magnesium, aluminium and then boron. Hence, the order is correct. Therefore, Statement I is true.
Step 2: Analysis of Statement II Atomic radius is not always greater than ionic radius. For cations, ionic radius is smaller than atomic radius. For anions, ionic radius is larger than atomic radius. Hence, this statement is incorrect. Therefore, Statement II is false.
Step 3: Conclusion Statement I is true but Statement II is false. So, the correct option is B.
Assuming metallic character depends only on atomic size. This is wrong because periodic trend across periods and down groups must both be considered. Compare position in the periodic table before ranking metallic character.
Thinking atomic radius is always greater than ionic radius. This is wrong because cations become smaller after losing electrons, while anions become larger after gaining electrons. Always check whether the ion is positive or negative.
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