Q70 of 400 Page 171

An element A has 4 valence electrons in its atom whereas element B has only one valence electron in its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed ? Give its electron-dot structure.

Since covalent compounds are non-conductor of electricity so the formed bond will be covalent. Its electron dot structure can be shown by



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68 A metal combines with a non-metal by the transfer of electrons to form a compound Y.

(i) State the type of bonds in Y.


(ii) What can you say about its melting point and boiling point ?


(iii) Will it be a good conductor of electricity?


(iv) Will it dissolve in an organic solvent or not ?

 69 The electronic configurations of three elements X, Y and Z are as follows:

X 2, 4


y 2, 7


z 2, 1


(a) Which two elements will combine to form an ionic compound?


(b) Which two elements will react to form a covalent compound ? Give reasons for your choice.

 71 In the formation of a compound XY2 atom X gives one electron to each Y atom. What is the nature of bond in XY2 ? Give two properties of XY2 73 The electronic configurations of two elements A and B are given below:

A 2, 6


B 2, 8, 1


(a) What type of chemical bond is formed between the two atoms of A?


(b) What type of chemical bond will be formed between the atoms of A and B?