13.4 billion years is 3 times of the half-life, 4.47 billion years. So the Uranium-238 will go through three times of half decay. So the remain percentage will be 50%*50%*50%=12.5%.
B. Slower than the gas is the answer
When two element combine to form more than one compound i hope this helps you with work have a nice day :)
Los metales son materiales que se obtienen a partir de minerales que forman parte de las rocas. Por ejemplo, el metal hierro se extrae de minerales de hierro como la magnetita o la siderita.
If that is your picture, then the answer is that
Geometry A is trigonal planarand Geometry B is trigonal pyramidal
