Lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.
What is atomic mass?
The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit.
One lithium (Li) atom can combine with one fluorine (F) atom. Together, they make the formula LiF.
Fluorine has seven electrons of it's own. Lithium gives up its one electron to make both atoms happy.
Hence, lithium reacts with one atom of fluorine, and the atomic mass of fluorine is 38 amu.
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