The atomic radii decreases by increasing atomic number in
Correct answer: C. Elements from Li to Ne
- A. Alkali metals
- B. Alkaline earth metals
- C. Elements from Li to Ne
- D. Halogens
Explanation
As we move across a period (horizontal row) in the periodic table from left to right, the atomic number increases,meaning more protons and electrons are added to the nucleus and electron shells, respectively. This increase in nuclear charge attracts the electrons more tightly, resulting in a decrease in atomic radius. Therefore, elements from Lithium (Li) to Neon (Ne) in the second period would exhibit shrinking atomic radii.
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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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