How many protons does the As3+ ion possess?

Five students independently measured the density of water. Their values were: and . The literature value for the density of water at 25°C is . The group of results can be classified as:

A student performs an experiment to determine the density of a sugar solution.  She obtains the following results for 4 trials:  1.11 g/mL. 1.81 g/mL, 1.95 g/mL, 1.75 g/mL.  How should she report her final results, including the uncertainty of her measurements?

Identify the element from its atomic notation: 〖_48^112〗X

What prefix multiplier is most appropriate for reporting a measurement of 7.92 * 10-9 m?

What is the mass of 6.78 * 1024 molecules of SO2?

Rutherford proposed the ___________________.

How many protons, neutrons, and electrons are in: (_34^79)Se^(2-)

An ion has 12 p+, 14 no, and 10 e-. The symbol for the ion is:

All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements.  Which Law does this refer to?