Use the periodic table to answer the question about fluorine(F)

How many neutrons does the isotope F-19 have?

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?