Boron is non metal while other elements of IIIA group are metals. This is because______________?
Correct answer: D. all of the above
- A. it has small size
- B. it has high nuclear charge
- C. it forms molecular addition compounds
- D. all of the above
Explanation
Boron has a very small atomic size, high ionisation energy and high charge density, so it forms mainly covalent molecular compounds rather than metallic structures; these features explain its non-metallic character. Students may choose only a because size is the clearest factor, but the listed properties together are intended to explain boron's unusual position in Group 13.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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