An element having electronic configuration [Ar] 3d⁵4s¹ belongs to :
Correct answer: A. d-block
- A. d-block
- B. f-block
- C. s-block
- D. p-block
Explanation
The electronic configuration shown, [Ar] 3d⁵ 4s¹, is that of Chromium (Cr). Since the last electron differentiating it from the previous element enters the d-orbital, it is classified as a d-block element.
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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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