Give reason. (a) Copper metal is a pure substance (b) A copper metal alloy brass is a mixture

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

The element that has the greatest electronegativity is

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.