원자 번호 9번의 화학 원소로, 할로겐 원소 중 하나인 독성이 있는 연한 황색 기체이며 모든 원소 중 반응성이 가장 강함.
The chemical element of atomic number 9, a poisonous pale yellow gas of the halogen series, known as the most reactive of all elements.
예문:
"Fluorine is the most electronegative element in the periodic table."
"Scientists use fluorine compounds to create high-performance polymers like Teflon."
"Due to its high reactivity, fluorine is rarely found in its pure form in nature."