How do I determine the number of a particle in a compound?

At room temperature what happens to the average kinetic energy of the molecules of a solid, liquid, and a gas

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.