Water

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On a chemistry class, the teacher taught the students about chemical formula.

Chemical Formula Definition: An expression which states the number of atom for each element that present in a molecule of a substance.

"For example, the chemical formula for water is H2O."

-Ring-

"Okay, guys. See you tomorrow."

-The next day-

"Today, I need a student to write the chemical formula of water. James, please write it on the whiteboard. Thank you."

Then he wrote:
H I J K L M N O
And said, "H2O!"

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