Đáp án + giải thích các bước giải:
Bài `1:`
\begin{array}{|c|c|c|}\hline \text{Tên nguyên tố}&\text{KHHH}&\text{Tổng số hạt}&\text{Số p}&\text{Số e}&\text{Số n}\\\hline \text{Natri}&\text{Na}&\text{34}&\text{11}&\text{11}&\text{12}\\\hline \text{Lưu huỳnh}&\text{S}&\text{46}&\text{16}&\text{16}&\text{14}\\\hline \text{Cacbon}&\text{C}&\text{18}&\text{6}&\text{6}&\text{6}\\\hline \text{Lưu huỳnh}&\text{S}&\text{48}&\text{16}&\text{16}&\text{16}\\\hline\end{array}
