某主族元素的原子最外层电子排布是5s1，下列描述中正确的是( )
A．其单质常温下跟水反应不如钠剧烈
B．其原子半径比钾原子半径小
C．其碳酸盐易溶于水
D．其氢氧化物不能使氢氧化铝溶解
答案：C
正确答案：C
原子最外层电子排布是5s1，铷，A、不正确，铷与水反应比钠剧烈；B、不正确，其原子半径比钾原子半径大；C、正确；D、不正确，其氢氧化物碱性比NaOH更强，能使氢氧化铝溶解
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