The atomic radii decreases by increasing atomic number in________________?
Correct answer: C. Elements from Li to Ne
- A. Alkali metal
- B. Alkaline earth metal
- C. Elements from Li to Ne
- D. Halogens
Explanation
From Li to Ne, electrons are added to the same second shell while nuclear charge increases, so effective nuclear attraction increases and atomic radius decreases. The likely mistake is a group of metals, where an extra electron shell is added down the group and atomic radius generally increases.
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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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