Which of the following are correct statements? check all that apply. a. potassium (k) and magnesium (mg) are not in the same periodic table period. b. potassium (k) and magnesium (mg) are both nonmetals. c. carbon (c) and oxygen (o) are in the same periodic table group. d. potassium (k) and magnesium (mg) are not in the same periodic table group. e. carbon (c) is a metal and oxygen (o) is a nonmetal. f. carbon (c) and oxygen (o) are both metalloids