Lanthanum is a member of
Correct answer: C. d-Block
- A. s-Block
- B. p-Block
- C. d-Block
- D. f-Block
Explanation
Lanthanum is classified as a d-block element because its electron configuration ends with a d orbital (5d1). Although it is often grouped with the lanthanides which are f-block elements, lanthanum itself does not have electrons in an f orbital. The s-block contains elements like the alkali and alkaline earth metals, and the p-block contains elements from groups 13 to 18. Therefore, options A and B are incorrect. Option D is incorrect because lanthanum does not fill its outermost electrons in an f orbital.
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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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