The trend in the densities of elements of Group III-A of the Periodic Table is
Correct answer: A. A gradual increase
- A. A gradual increase
- B. A gradual decrease
- C. First decrease then increase
- D. First increase then decrease
Explanation
A is correct because as we move further along a group, mass of the atoms increases due to increased no. of protons and neutrons, hence the nucleus experiences stronger attractive forces and atomic radius becomes smaller.B is incorrect as density doesnt decrease, it increases.C is incorrect as it only increases.D is incorrect as it only decreases
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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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