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Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d