How many neutrons does element x have if its atomic number is 39 and its mass number is 84?

Tall, cone-shaped mountains in which layers of lava alternate with layers of ash are called a. shield volcanoes. b. cinder cone volcanoes. c. composite volcanoes. d. lava plateaus. select the best answer from the choices provided a b c d i need asap

According to the loco mass the mass of reactants and products

Rotenone is an insecticide that is toxic