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【单选题】
钛(Ti)元素的同位素有 Ti Ti Ti Ti Ti,下列说法中不正确的是(　　)。
A.
上述同位素中,Ti原子核中的中子数不可能是30
B.
题述中包括5种钛元素,且质子数都是22
C.
题述中包括5种钛原子,即钛的5种核素
D.
钛的相对原子质量不可能为46,也不可能为50
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