Q. 755.0( 2 Votes )
An element X of atom
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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