Which of the following series of elements have nearly the same atomic radii?

F . C l, B r, I

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N a, K, R b, C s

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L i, B e, B, C

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F e, C o, N i, C u

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Solution

The correct option is D $F e, C o, N i, C u$
These are transition metals with the $(n - 1) d^{1 - 10} {n s}^{1 - 2}$ configuration. The atomic number and ionic radii of transition elements in a given series show a decreasing trend for the first five elements and then becomes almost constant for the next five elements.

Hence, option $D$ is correct.

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N a, L i, R b,

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The correct order of reactivity of alkalimetals towards $H_{2}$ is

Arrange the following as per instructions given in the brackets.

(a) Mg. Cl, Na, S, Si (decreasing order of atomic size)

(b) Cs, Na, Li, K, Rb (increasing metallic character)

(d) Cl, F, Br, I (increasing electron affinity)

(e) Cs, Na, Li, K, Rb (decreasing electronegativity)

In which of the following sets, elements have nearly same atomic radii?

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