What is the total number of nuclei in Al, U, Al+3, S2-, SO2, SO2-3, NH+4?

Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size

Which change to the system wood cause the freely-moving piston to lower?

If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3