Final answer:
Charges in a molecule can be determined by looking at the charges of the atoms in a polar covalent bond. We use the symbols δ+ and δ- to represent partial positive and negative charges, respectively.
Step-by-step explanation:
When determining whether a molecule is (+) or (-), we look at the charges of the atoms within the molecule. In a polar covalent bond, we use the lowercase Greek letter delta (δ) with a plus sign (+) or minus sign (-) to indicate whether an atom has a partial positive or negative charge. For example, in H-Cl, the chlorine atom has a partial negative charge (δ-) while the hydrogen atom has a partial positive charge (δ+).