1.

Which of the following is a sympneutronic group?

A. 6C¹²7N¹⁴8O¹⁶
B. 6C¹²7N¹⁴8O¹⁸
C. 6C¹²7N¹⁵8O¹⁶
D. 6C¹⁴7N¹⁵8O¹⁶
Answer» E.


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