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

What is created when solids, liquids, an gases mix with one another

How to tell if two objects are in thermal equilibrium 1.the objects have the same temperature 2.the objects are the same size 3.the objects are touching each other 4.the objects temperatures are changing

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.