In general, their densities increase when moving down the table, with the exception that potassium is less dense than sodium.
ɪn dʒˈɛnɚɹəl, ðɛɹ dˈɛnsᵻɾiz ˈɪŋkɹiːs wɛn mˈuːvɪŋ dˌaʊn ðə tˈeɪbəl, wɪððɪ ɛksˈɛpʃən ðæt pətˈæsiəm ɪz lˈɛs dˈɛns ðɐn sˈoʊdiəm.