How do valence electrons determine a elements chemical properties?

When you mate two plants together the terms is called? answer it fast as possible plz! i have a test tomorrow!

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

An experimental procedure requires a 10 ml of acid to be dissolved