The most electronegative element of the third period is
Correct answer: D. Cl
- A. F
- B. P
- C. Br
- D. Cl
Explanation
The correct answer is Cl. Chlorine, located in the third period and group 17 of the periodic table, is the most electronegative element in that period. Electronegativity increases across a period from left to right due to increasing nuclear charge, which attracts the bonding pair of electrons more strongly. Fluorine, while being the most electronegative element overall, is found in the second period. Phosphorus, being further left in the periodic table, has a lower electronegativity than chlorine. Bromine is not in the third period; it is in the fourth, making it an incorrect choice.
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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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