Using the Periodic Table of Elements, fill in the chart below to identify and describe the properties of the halogens. Element Name Group Number Period Number Valence Properties/Reactivity Uses Using the Periodic Table of Elements, fill in the chart below to identify and describe the properties of the nonmetals. Element Name Group Number Period Number Valence Properties/Reactivity Uses Describe the unique properties of water. Be sure to include an explanation of the filtration systems we use to keep water safe for drinking. What is the Earth’s atmosphere composed of, and why is it important?

0.11 m/s and 0.28 m/s should be correct

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

365.25 earth days are in the year of a light year