Whats your name this is so you can get points or whatever

Iknow the answer is a but i don't know why

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.

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2