(i) N and O |
(ii) Br and K |
(iii) Be and B |
(iv) \[I\text{ }and\text{ }{{I}^{}}\] |
(iv) \[\,Li\text{ }and\,\,L{{i}^{+}}\] |
(v) O and S |
(vii) Ba and Sr |
Answer:
2
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