A student finds that an unknown element reacts with elements from Group 2 (IIA). To which group does the unknown element most likely belong? A.
Group 1 (IA)

B.
Group 3 (IIIB)

C.
Group 16 (VIA)

D.
Group 18 (VIIIA)

What is the chemical formula of the following compound

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.

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?