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【单选题】
下列有关结构和性质的说法正确的是
A.
元素铯的两种核素 多4个质子
B.
P、S、C1得电子能力和最高价氧化物对应水化物的酸性均依次增强
C.
元素原子的最外层电子数越多，越容易得电子
D.
从上到下，第VIIA族元素氢化物的热稳定性和还原性均依次减弱
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