Which symbol represents a particle that has the same total number of electrons as s2-?
a)o2-
b)si
c)se2-
d)ar

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

What’s the percent by mass of carbon in c10h14n2

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5