What materials be smaller amount dense afterwards metals and floated to the top to form an atmosphere?
Answers:
Gasses floated up, many being released from volcanic outgassing. Check out the sources and here is a chart of what you would find within our atmosphere by %:
Composition of dry atmosphere, by volume[5]
ppmv: parts per million by volume
Gas Volume
Nitrogen (N2) 780,840 ppmv (78.084%)
Oxygen (O2) 209,460 ppmv (20.946%)
Argon (Ar) 9,340 ppmv (0.9340%)
Carbon dioxide (CO2) 383 ppmv (0.0383%)
Neon (Ne) 18.18 ppmv (0.001818%)
Helium (He) 5.24 ppmv (0.000524%)
Methane (CH4) 1.745 ppmv (0.0001745%)
Krypton (Kr) 1.14 ppmv (0.000114%)
Hydrogen (H2) 0.55 ppmv (0.000055%)
Nitrous oxide (N2O) 0.3 ppmv (0.00003%)
Xenon (Xe) 0.09 ppmv (9x10-6%)
Ozone (O3) 0.0 to 0.07 ppmv (0%-7x10-6%)
Nitrogen dioxide (NO2) 0.02 ppmv (2x10-6%)
Iodine (I) 0.01 ppmv (1x10-6%)
Carbon monoxide (CO) trace
Ammonia (NH3) trace Source(s): http://en.wikipedia.org/wiki/Earth's_atm…
http://search.yahoo.com/search;_ylt=A0oG…
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