Are molecules held together by ionic bonds or covalent bonds?

Answer 1

Both. Most organic molecules are help togther almost exclusively by covalent bonds. A molecule of table salt (sodium chloride) is held together by an ionic bond. The nature of the bonds (ionic or covalent) depends on the atoms involved. A bond shared by two atoms with very different electronegativities (as in the above example) tend to be ionic, whereas bonds between atoms with similar electronegativities (like carbon and oxygen) are covalent.

Answer 2

If you mean how a molecule is formed, then for a general rule, molecules that are formed with atoms really close together on the Periodic Table are held together by covalent bonds (This is not exclusive, of course). Ionic bonds are mostly in molecules with atoms really far apart in the Periodic Table, ie. NaCl. These form crystals, which is not actually a bond but intra-molecular interaction. Na+ is attracted to Cl-.
If you mean how molecules, like how 5 water molecules are held together, or how water molecules and CH3OH are held together in a solution, then there would be no covalent bonds. These are intermolecular rxns, these depend on the properties of the molecules. These rxns are merely attraction forces, not actually linking bonds.

Answer 3

In an ionic bond, the atoms are certain jointly by potential of the charm between oppositely-charged ions. case in point, sodium and chloride form an ionic bond, to make NaCl, or table salt. In a covalent bond, the atoms are certain by potential of shared electrons. If the electron is shared the two between the atoms forming a covalent bond, then the bond is asserted to be nonpolar. many times, an electron is extra attracted to a minimum of one atom than to a diverse, forming a polar covalent bond.

Answer 4

Molecules are held together by covalent bonds. Ionic bonds hold ions together in a crystal.