Which of these periods contain elements with electrons in's. p, d, and forbitals? OA periods 1-3
OB. periods 1-4
OC. periods 3-5
OD. periods 6-7

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

What effect might melting sea ice have for people who live in coastal areas?

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.