Which element can form tripositive ion ?
Correct answer: D. Aluminium
- A. Beryllium
- B. Carbon
- C. Silicon
- D. Aluminium
Explanation
Aluminium forms the stable tripositive ion Al3+ by losing its three valence electrons and attaining a noble-gas configuration. Beryllium commonly forms Be2+, while carbon and silicon generally form covalent compounds rather than simple C3+ or Si3+ ions. The likely trap is carbon because it has four valence electrons, but carbon does not normally form a free tripositive ion.
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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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