Which one of the followings possesses melting point below 0°C?
Correct answer: A. Nitrogen
- A. Nitrogen
- B. Phosphorus
- C. Carbon
- D. Bismuth
Explanation
Nitrogen exists as N2, a small non-polar molecule with weak London dispersion forces, so it melts at about -210°C, below 0°C. Phosphorus, carbon and bismuth have much higher melting points because their particles are held by stronger atomic or metallic bonding. The likely trap is phosphorus because it is also a non-metal, but phosphorus melts near 44°C.
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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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