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Why are transition elements given that name? Choose the most appropriate option.
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Variable valency
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Having different colors
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Constant valency
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Both A and B
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Transition elements are given that name because they exhibit variable valency and often have different colors. Variable valency means that these elements can form ions with different charges, due to the involvement of d-orbitals in bonding. This characteristic leads to a variety of oxidation states. Additionally, many transition elements and their compounds display a range of colors, which is due to the d-d electron transitions when they absorb visible light. These properties are distinct and significant, making the name "transition elements" particularly appropriate for this group in the periodic table.
