Question

A.which two element will combine to form ionic compound
x-2,4 ,y-2,7 z-2,1

Answer 1

Here is your required answer:

The two element y - 2,7 and z - 2,1 will form as ionic compound because y element requires one more electron to satisfy its electronic configuration and z element has an extra electron to donate. Hence y and z will form an ionic compound.

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Answer 2

Explanation:

Y and Z will combine to form the ionic compound.

The trick for finding this out is checking which two elements have the least and most value in the OUTERMOST shell. (outermost shell value is the last number)

The sum of these two values should be around or equal to 8 as atoms are more stable when their outermost shell is filled with 8 electrons.

in this case 7+1 = 8 so the answer will be Y and Z.

When solving a similar type of question if you don't get the sum as 8 but get 7 or 6 then also it's fine because the atoms can combine in the way XY2 (for eg when the values are X :- 2,6 and Y:- 2,1) but 8 is more appropriate. Not this question though.