JAMB - Chemistry (1982 - No. 22)
If atom X with six electrons in its outermost shell combines with atom Y with one electron in its outermost shell to form an ionic compound, then?
six atoms of X will combine with one of Y
two atoms of X will combine with six of Y
one atom of X will combine with two of Y
two atoms of X will combine with one of Y
one atom of X will combine with six of Y
Explanation
- When an element in group 1 takes part in a reaction, its atoms lose their outer electron and form positively charged ions , called cations .
- Group 6 elements, have 6 valence electrons and will tend to take 2 electrons and have a valency of -2.
- Hence; one atom of element X will require two atoms of Y
- To form a compound XY\(_2\) or Y\(_2\)X
For example, you can consider Oxygen as atom X(with electronic configuration of 2,6) and Sodium as atom Y(with electronic configuration of 2,8,1). When they combine, two atoms of Na will combine with one atom of O, giving rise to Na\(_2\)O → Y\(_2\)X
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