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d and f BLOCK ELEMENTS
Question #38530
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What is the role of the 4f orbitals in determining the properties of 5d series elements?
A. They provide excellent shielding for 5d electrons
B. Their poor shielding causes Lanthanoid contraction, affecting 5d element sizes
C. They determine the number of valence electrons in 5d elements
D. They have no effect on 5d element properties
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