What is the si unit for acceleration?

These models show the electron structures of two different nonmetal elements. which element is likely more reactive, and why? element 1 is more reactive because it has fewer electron shells and is toward the top of its group on the periodic table. element 1 is more reactive because it has more electrons in its valence shell and is farther to the right on the periodic table. element 2 is more reactive because it does not have a valence shell close to the nucleus, so it will attract electrons. element 2 is more reactive because it does not have a full valence shell, so it will attract electrons.

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up