How many atoms are contained in 0.633 moles of Ni? ( show work)

Which of the following electromagnetic waves can create ions?

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.