Which practice may be considered unethical To some but prevents unnecessary human harm

Theoretically, which metal should be the most reactive? hydrogen lithium francium fluorine

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.

What type of electromagnetic radiation has a shorter wavelength than blue light