Chlorine exist in Nature as two Chlorine atoms covalently bonded together Why does this occur

Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion

Answerhave high resistance to flow