MemorizationPractice

hydrogen lithium sodiam NA sodium Na Sodium Na Sodium Na sodium Na sodium Na potassium rubidium rubidium rubidium rb rubidium Rb rubidium Rb rubidium Rb rubidium Rb cesium cesium cesium cesium cesium Cs cesium Cs cesium Cs cesium francium francium fracium francium fr francium Fr francium Fr francium Fr Beryllium Beryllium Beryllium Beryllium Be Beryllium Be beryllium Be beryllium Be magnesium calcium strontium strontium strontium strontium strontium sr strontium sr strontium Sr strontium Sr barium barium barium barium barium ba barium ba barium ba barium Ba barium Radium radium radium Ra radium Ra radium Ra radium Ra radium aluminum carbon silicon fluoride chloride chloride chloride Cl chloride Cl chloride Cl chloride Cl chloride bromide bromide bromide bromide Br bromide Br bromide Br bromide Br bromide Br iodide astatide astatide astatide astatide At astatide At astatide At astatide At astide At hydride oxide sulfide selenide selenide Se selenide Se selenide Se selenide Se selenide Se telluride telluride telluride Te telluride Te telluride Te telluride Te telluride Te telluride nitride phosphide arsenide arsenide arsenide As arsenide As arsenide As arsenide As arsenide As carbide silicide

copper copper copper Cu copper Cu copper Cu copper Cu Tin Tin tin Sn tin sn tin Sn tin Sn tin Sn tin Chromium Chromium Chromium Cr chromium Cr chromium Cr chromium vanadium vanadium vanadium vanadium V vanadium V vanadium V vanadium V Iron iron iron Fe iron Fe iron Fe iron Fe iron Fe iron mercury mercury hg mercury hg mercury Hg mercury Hg mercury gold gold gold Au gold Au gold Au gold Lead lead Pb lead Pb lead Pb lead cobalt cobalt cobalt cobalt Co cobalt co cobalt Co Titanium titanium titanium Ti titanium Ti titanium Ti titanium Manganese manganese manganese manganese Mn Manganese manganese Mn Mn Mn nickle nickle nickle nickle Ni nickle Ni nickle Ni nickle Ni nickle