Plz i really need answers but i'm way to busy to do this assignment

Which feature do highland climates have that lower elevation areas do not?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals