the mass of a rubber stopper is found to be 6g. the science teacher tells the class to use 7.5 g as the standard value for the rubber stopper. what is the percent error

Where are each of the three particles located within the atom?

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.