What happens if you fail a quarter in high school, does that credit not count anymore ? and do i have to retake the class if i pass the other 3 quaters

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.

Acompound has a molecular weight of 12.124 atomic mass units and the empirical formula c3h40. what is the molecular formula of the compound?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.