Number of valence electrons for nitrogen

What is the half-life of a radioisotope if a 40 g sample becomes 10 g after 20 minutes?

The river Ganga does not dry in summer

An object that is more dense than the fluid it is immersed in will do what?

Indicate the mechanism that the osmium tetroxide follows to form the cyclic osmate intermediate. when drawing curved arrows showing electron flow, use the dotted lines to make sure that the curved arrows properly indicate the two atoms forming the

What type of bond would form between two atoms of fluorine? A. Single ionic bond B. Double covalent bond C. Single covalent bond D. Double covalent bond

If a fast moving car making a loud noise approaches and moves past the person what will happen as the distance between the two increases?

Which of the following would be an example of a trophic relationship? Select all that apply. photosynthetic plankton respiring oxygen into the ocean small marine life feeding on the algae and plankton that have descended to the ocean floor a

Fumaric acid is an organic compound composed of 41.39%, 3.47%, and the rest oxygen. If 0.288 mol of fumaric acid has a mass of 33.4 g, what are the empirical and molecular fomulas of fumaric acid

What is an isotope? Give an example of an element with isotopes.

Consider the reaction between liquid water and aqueous magnesium nitride to form solid magnesium oxide and ammonia gas. If magnesium nitride is present in excess, how many moles of water are needed to form 9.17*1023 ammonia molecules?