What two elements do not need eight valence electrons to stay stable?

What is the mass of nitrogen in a 10g sample of pure ammonium nitrate?

The maximum oxygen intake level can only be measured using the multistage fitness test. a. True b. False

A radar gun records the speed of a projectile to be 120.090 m/s. How many significant digits are present in this measurement?

How can nonrenewable mineral resources be used more sustainably?

If there are 128 neutrons in pb-210, how many neutrons are found in the nucleus of pb-206?

For the separation of the unknown mixture, you are instructed to isolate the amine followed by the acid and finally the neutral. Does the order matter? If not, what other orders could be followed?

As ice melts and changes from solid to liquid, A) entropy increases. B) kinetic energy decreases. C) an exothermic reaction occurs. D) the random movement of molecules remains constant.

What volume of 0.480 m koh is needed to react completely with 15.8 ml of 0.150 m h2so4? assume the reaction goes to completion?

Which sample of water contains particles having the highest average kinetic energy?

Use the terms magnetic field and magnetic pole in a sentence