- Are isotopes of an element still the same element?

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If 2.25 l of methane gas burns, how many moles of oxygen will be needed for complete combustion? How do I convert Kilograms/m^2 of snow to centimeters? Identify the 16th term of a geometric sequence where a1 = 4 and a8 = −8,748.? Http://slideonit.com/condensation-boiling-full-explanation-detail/? What does the number of the solutions of the equations 4x^2 + 4x + 1 tell you and how can you write x^2 - 2x - 7 in completed square form?