Boron is non-netal whereas A1 is metal. It is due to_______________________?
Correct answer: C. Both A and B
- A. Small size
- B. High nuclear charge
- C. Both A and B
- D. No authorized justification yet
Explanation
Boron has a very small atomic size and a high effective nuclear attraction for its valence electrons, giving it high ionisation energy and predominantly covalent, non-metallic character. Aluminium is larger and more metallic, so both small size and strong nuclear attraction explain the difference in this simplified comparison. The likely mistake is choosing only small size and ignoring the effect of nuclear attraction on ionisation energy.
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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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