In which of the following pairs are elements belonging to the same group ?
Correct answer: B. Nitrogen & Phosphorous
- A. Boron & Beryllium
- B. Nitrogen & Phosphorous
- C. Magnesium & Aluminium
- D. Gallium & Helium
Explanation
Nitrogen and phosphorus are both in Group 15, with five valence electrons and similar chemical behaviour. The likely mistake is choosing a because boron and beryllium are both in the second period, but belonging to the same period does not mean belonging to the same group.
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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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