Select the most stable covalent hycride:
Correct answer: C. HF
- A. BiH3
- B. NH3
- C. HF
- D. SbH3
Explanation
The most stable hydride will have the greatest electronegativity difference since the bond energy will then also be the greatest. Fluorine is the most electronegative element so it's electronegativity difference with hydrogen will be the greatest and it will be most stable as there will be greatest electrostatic attraction between hydrogen and fluorine
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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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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