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Question
Assertion :Transition elements exhibit horizontal and vertical relationship. Reason: The shielding effect as well as same outermost shell configuration in transition metals are responsible for their behaviour.
Assertion :Transition elements exhibit horizontal and vertical relationship. Reason: The shielding effect as well as same outermost shell configuration in transition metals are responsible for their behaviour.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The transition metals, groups 3–12 in the periodic table, are generally characterized by partially filled d subshells in the free elements or their cations. Unlike the s-block and p-block elements, the transition metals exhibit significant horizontal similarities in chemistry in addition to their vertical similarities. This is because the size of neutral atoms of the d-block elements gradually decreases from left to right across a row, due to an increase in the effective nuclear charge (Zeff) with increasing atomic number. In addition, the atomic radius increases down a group, just as it does in the s and p blocks.Hence, option A is correct
The transition metals, groups 3–12 in the periodic table, are generally characterized by partially filled d subshells in the free elements or their cations. Unlike the s-block and p-block elements, the transition metals exhibit significant horizontal similarities in chemistry in addition to their vertical similarities. This is because the size of neutral atoms of the d-block elements gradually decreases from left to right across a row, due to an increase in the effective nuclear charge (Zeff) with increasing atomic number. In addition, the atomic radius increases down a group, just as it does in the s and p blocks.
Hence, option A is correct
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