Final answer:
A double positive partial charge is not possible; partial charges, indicated by the delta symbol with a plus (δ+) or minus (δ-) sign, represent a fraction of a full charge and signify a difference in electronegativity in polar covalent bonds.
Step-by-step explanation:
To determine if a partial charge is double positive, we must understand how charges are indicated in chemical notation. In chemistry, the convention for indicating a full charge on an ion is to list the magnitude of the charge as a right superscript next to the symbol of the element. If the charge is a single positive or negative, the number 1 is not written; if the magnitude of the charge is greater than 1, then the number is written before the + or - sign. For example, the barium cation with a double positive charge is written as Ba2+, not Ba+2. However, for partial charges, which are less than a full unit charge, we use a different notation.
In cases of polar covalent bonds, atoms may have partial charges due to differences in electronegativity. We designate these using the lowercase Greek letter "delta," δ, followed by a plus sign for a partial positive charge (e.g., δ+) or a minus sign for a partial negative charge (e.g., δ-). A double positive partial charge in this context is not possible. Partial charges represent a shift in electron density and thus are always a fraction of a full charge, which is represented by the delta symbol with a plus or minus sign to indicate whether the partial charge is positive or negative.