Final answer:
The correct placard for lithium batteries is 9, and following safety regulations during transportation is essential.
Explanation:
The correct placard to use to identify a cargo containing lithium batteries is 9.
In the 'crisscross' method, the numerical value of each charge crosses over to become the subscript of the opposite ion, and the signs of the charges are dropped.
When transporting lithium batteries, safety regulations and proper identification are crucial to ensure compliance and safety.
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