What is the difference between a compound and a homogenous mixture​

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

The number at the end of an isotope’s name is the number.

Answer explain why it is not possible to deduce a complete order of reactivity.