If a 25 g sample of nitrogen-16 undergoes 4 half-lives, how much of the original sample will remain?

All of the following are part of the biosphere except

What are the chemical names of these compounds? ke: mg3n2: reset next

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.