Pure alkali metals are dangerously reactive with air and water and must be kept away from heat, fire, oxidising agents, acids, most organic compounds, halocarbons, plastics, and moisture.
pjˈʊɹ ˈælkəlˌaɪ mˈɛɾəlz ɑːɹ dˈeɪndʒɚɹəsli ɹɪˈæktɪv wɪð ˈɛɹ ænd wˈɔːɾɚɹ ænd mˈʌst biː kˈɛpt ɐwˈeɪ fɹʌm hˈiːt, fˈaɪɚ, ˈɑːksɪdˌaɪzɪŋ ˈeɪdʒənts, ˈæsɪdz, mˈoʊst ɔːɹɡˈænɪk kˈɑːmpaʊndz, hˈeɪləkˌɑːɹbənz, plˈæstɪks, ænd mˈɔɪstʃɚ.