The answer is B, sodium is an element.
Answer:
the sum of average kinetic molecules of the body is called temperature..
Hot-air balloons float because the air caught inside the balloon is heated up by a burner, making it less dense than the air outside. As the burner heats the air, it expands and some of the air escapes; that's what makes it less dense
The electromagnetic force is attractive for unlike charges and repulsive for like charges
