Q36 of 52 Page 43

Arrange the following elements in increasing order of their atomic radii.

(a) Li, Be, F, N


(b) Cl, At, Br, I

F < N < Be < Li (Li, Be, F and N belong to same period of modern periodic table. As we move from left to right in a group, the atomic radii of elements decreases due to high atomic charge but the number of shell remain constant).


(b) Cl < Br < I < At (Cl, At, Br and I belong to same group of periodic table that is group 17. As we move down in a group, the atomic radii of elements increase due to increase in the number of shell of an element).

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34

If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?

 35

Compare the radii of two species X and Y. Give reasons for your answer.

(a) X has 12 protons and 12 electrons


(b) Y has 12 protons and 10 electrons

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Identify and name the metals out of the following elements whose electronic configurations are given below.

(a) 2, 8, 2


(b) 2, 8, 1


(c) 2, 8, 7


(d) 2, 1

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Write the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17). Draw its electronic dot structure. What is the nature of the bond formed?