What is the primary basis upon which we divide the ingredients of the solar nebula into four categories (hydrogen/helium; hydrogen compound; rock; metal)?

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The primary basis upon which we divide the ingredients of the solar nebula into four categories (hydrogen/helium; hydrogen compound; rock; metal) is the temperatures at which various materials will condense from gaseous form to solid form. This is known as the condensation temperature, and it determines which materials will form the solid cores of planets or remain in gaseous form. The temperature at which hydrogen and helium condense is lower than that of hydrogen compounds, which is lower than that of rock-forming materials, and the temperature at which metals condense is the highest. Therefore, this temperature-based classification separates the ingredients of the solar nebula into their respective categories.

What Is the Primary Basis Upon Which We Divide the Ingredients