某碱金属元素A(此处用A代替其元素符号),其原子半径比钠原子半

某碱金属元素A(此处用A代替其元素符号),其原子半径比钠原子半径大,则下列关于A的推论不正确的有

   AA原子的最外电子层上只有1个电子  

   BA单质和水反应比钠和水反应剧烈

   CA的氢氧化物的碱性比NaOH碱性强

   DA的单质和氧气反应比钠和氧气反应剧烈,且反应产物一定是A2O

答案

D

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