The elements with atomic numbers 58 to 71 are called:
Correct answer: C. Lanthanides
- A. Normal elements
- B. Transition elements
- C. Lanthanides
- D. Actinides
Explanation
The lanthanide series, also known as the lanthanoids, is the block of 14 elements following Lanthanum (Z=57) in the periodic table. These elements, from Cerium (Z=58) to Lutetium (Z=71), are characterized by the filling of the 4f electron subshell.
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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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