Q75 of 400 Page 171

An element X of atomic number 12 combines with an element Y of atomic number 17 to form a compound XY2. State the nature of chemical bond in XY2 and show how the electron configurations of X and Y change in the formation of this compound.

When an element X of atomic number 12 combines with an element Y of atomic number 17 to form a compound XY2. The nature of chemical bond in XY2 is ionic. The electronic configuration of X changes from 2, 8, 2 to 2, 8; The electronic configuration of Y change from 2, 8, 7 to 2, 8, 8.

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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?

 76 The electronic configurations of three elements A, B and C are as follows:

A 2, 8, 1


B 2, 8, 7


C 2, 4


(a) Which of these elements is a metal?


(b) Which of these elements are non-metals?


(c) Which two elements will combine to form an ionic bond?


(d) Which two elements will combine to form a covalent bond?


(e) Which element will form an anion of valency 1?

 77 The electric configurations of four particles A, B, C and D are given below

A 2, 8, 8


B 2, 8, 2


C 2, 6


D 2, 8


Which electronic configuration represents:


(i) magnesium atom?


(ii) oxygen atom?


(iii) sodium ion?


(iv) chloride ion?