Which compound is most ionic?
Correct answer: C. AlF
- A. Li2O
- B. MgO
- C. AlF
- D. NaF
Explanation
c) AlF (aluminum fluoride):AlF consists of aluminum (Al) and fluorine (F) atoms. Aluminum is a Group 13 element with a valence electron configuration of 3s23p1, while fluorine is a Group 17 element with a valence electron configuration of 2s22p5. When aluminum loses its three valence electrons and fluorine gains one electron, they form ions with a 3+ charge for aluminum (Al3+) and a 1- charge for fluorine (F-). The ionic bond between Al3+ and F- in AlF is stronger than in Li2O and MgO.
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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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