When an oxygen atom forms an ion, it gains two electrons. what is the electrical charge of the oxygen ion?

a.
+1

b.
-1

c.
-2

d.
+2

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these