Which type of bond is formed between magnesium and oxygen? a. ionic b. metallic c. polar covalent d. nonpolar covalent

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent

Which fact represents evidence for the big bang theory?

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?