Convert 78.9 kJ into calories Can you also explain how pls? ty

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.

Can someone me with these problems? see the attachment, .

Using the results from the two previous questions: solution one: 1 x 10-4 m solution two: 1 x 10-7m the hydrogen ion concentration of these two solutions differ from each other by a factor of