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Assertion: Transition elements are harder than alkali metals and alkaline earth metals. Reason: Hardness of transition metals is due to the large atomic size. |
Assertion and Reason both are correct statements and reason is the correct explanation for assertion. Assertion and Reason both are correct statements and reason is not the correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. |
Assertion is correct statement but reason is wrong statement. |
Transition elements are harder than alkali metals and alkaline earth metals and hardness is due to the presence of partially filled d-orbitals and small size, which helps in dπ - dπ bond formation and increasing the cohesive interactions of atoms.
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