The atomic weight of hydrogen is

1?

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

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Chemistry worksheet - i am not sure what they are asking for exactly?