Q71 of 400 Page 171

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

In the formation of a compound XY2 atom X gives one electron to each Y atom. the nature of bond in XY2 is ionic. The two properties of XY2 are

1) when it is dissolved in water it will conduct electricity.


2) It would have higher melting point as well as boiling.



More from this chapter

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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.

 70 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. 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?

 74 Four elements A, B, C and D have the following electron arrangements in their atoms:

A 2, 8, 6


B 2, 8, 8


C 2, 8, 8, 1


D 2, 7


(a) What type of bond is formed when element C combines with element D?


(b) Which element is an inert gas?


(c) What will be the formula of the compound between A and C?