Science , thank you for helping !!

Me i dont know what to do! 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.

Which formula can be used to calculate the molar mass of hydrogen peroxide

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit