Why does the notation 13c- have a negative sign

The negative symbol or negative sign simply indicates that for the C ion, there are more electrons than proton. Since it is – alone without number, this automatically indicates a number of -1. This means that there is one more electron than proton.

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.