硒是人体必需的一种微量元素,严重缺硒有可能诱发皮肤疾病。已知

硒是人体必需的一种微量元素,严重缺硒有可能诱发皮肤疾病。已知硒的原子序数为34质子数与中子数之和为79。下列有关硒原子的说法中,不正确的是(  

A.核外电子数为34                      B.核电荷数为79

C.质子数为34                          D.中子数为45

答案

B

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