Rb 181 Low melting point Be Mg Ca 98 29 27 Sr Ba Li Na K Rb Cs Fr
Be Mg Ca Sr Ba Rb Cs Low melting point Li Na K Rb Cs Fr
2.Chemical properties: ·React with oxygen、sulfur、nitrogen and halogen to form the corresponding compounds. The elementary substances form the corresponding oxides when they burn in air: Li,O Na202 KO2 RbO2 CsO2 BeO MgO CaO SrO BaO2 Na,O, Pale yellow Pale yellow Magnesium burning in air
The elementary substances form the corresponding oxides when they burn in air： Li2O Na2O2 KO2 RbO2 CsO2 BeO MgO CaO SrO BaO2 • React with oxygen、sulfur、nitrogen and halogen to form the corresponding compounds. 2.Chemical properties: Magnesium burning in air Li2O Na2O2 KO2 Pale yellow Pale yellow
.React with water 2M+2H,O->2MOH+H2(g) Li Na K Bromothymol blue indicator 溴百里酚兰指示剂 Ca
•React with water Li Na K Ca 2M + 2H2O → 2MOH + H2 (g) Bromothymol blue indicator 溴百里酚兰 指示剂
React with liquid ammonia: M(s)+x+y)NH3(I)M(NH3)++e(NH3) 导电性，顺磁性 a blue solution 痕量杂质， 2M(S+2NH3(0)→2M++2NH2+H2(g) 或光化作用 cfM+H20→Mt+OH+H2(g)
•React with liquid ammonia: a blue solution 2M(s) + 2NH3 (l) 2M+ + 2NH2 -+ H2 (g) c.f. M + H2O → M+ + OH- + H2 (g) M(s) + (x + y )NH3 (l) M(NH3 )x + + e(NH3 )y - 导电性，顺磁性 痕量杂质， 或光化作用
3.flame reaction Na黄 K紫 Ca橙（砖）红 Li Na K Sr深（洋）红 Ba黄绿 L深（洋）红 hu excitated Ca Sr Ba
3.flame reaction Na 黄 K 紫 Ca 橙(砖）红 Sr 深（洋）红 Ba 黄绿 Li 深(洋)红 excitated h