Please describe how we determine valence electrons in the main 8 octet groups, like how certain families have certain amounts. Explain, in complete sentences how we know things like Sodium has one valence electron and Chlorine has 7.

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction

Which of these is a density dependent factor? a. epidemic b. earthquake c. drought d. hurricane