Calculate the period of Mars if it is 1.45 AU from the sun. (pls show steps)​

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.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest