灵鹊做题网The atomic number of an element X is 15.The number of electr
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The atomic number of an element X is 15.The number of electrons in an anion of X is?
但是eleltrons不是等同atomic number吗?
A 10
B 12
C 15
D 18
但是eleltrons不是等同atomic number吗?
A 10
B 12
C 15
D 18
atomic number of an element 指的是：元素X的原子序数是15,核外有15个电子,所以该元素为P元素,即磷元素
而number of electrons in an anion of X问得是：X元素的阴离子核外电子数是多少?
因为P的最外层电子是5个电子,所以必须得到3个电子才满足8个电子的饱和结构
所以磷元素的阴离子核外电子数是：15+3=18
所以选D 18
不明白HI
而number of electrons in an anion of X问得是：X元素的阴离子核外电子数是多少?
因为P的最外层电子是5个电子,所以必须得到3个电子才满足8个电子的饱和结构
所以磷元素的阴离子核外电子数是：15+3=18
所以选D 18
不明白HI
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