Given the following data C =66.7% H =11.1% Calculate the empirical formula of the compound

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Calculate the number of molecules present in 0.750 mol of mgo.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?