How did Mendeleev organize the elements to create a periodic table?

alphabetically by element name

according to increasing mass and similar properties

according to the year of their discovery

according to increasing mass and number of protons

please help

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium