Element X and element Y have a difference in electronegativity of 0.7; will the bond XY be covalent or ionic? No links

                The bond between XY is Covalent

Explanation:

                   Types of Bonds can be predicted by either identifying the two bonding elements or by calculating the difference in electronegativity.

                    The two atoms bonded to each other can be both metals, non-metals or one metal and the other non-metal. If both are metals then we can say that the bond is metallic. If both are non-metals then we can say that the bond is nonpolar and covalent. If one is metal and the other is non-metal then the bond between them will be ionic.

Secondly,

If, Electronegativity difference is,

             Less than 0.4 then it is Non Polar Covalent  Bonding

             Between 0.4 and 1.7 then it is Polar Covalent  Bonding

             Greater than 1.7 then it is Ionic  Bonding

As, the element X and Y have the electronegativity difference of 1.2 (which is less than 1.7 and greater than 0.4) therefore, we can say that the bond between them is covalent and it is polar in nature.

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

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