fluorine

"$ is the symbol for dollars in the US and some other countries."

"I went to the park because the weather was nice. "

"Letters are the elements of written language."

"Table salt, or sodium chloride, is formed when the metal sodium reacts with chlorine, one of the halogens. "

"The small dog's playful attacks on my shoelaces always make me laugh. "

"The store had a wide selection of toothpastes, including whitening and fluoride options. "

"a big strong man; Jake was tall and strong"

"We lit the fire to get some heat."

"The nervous dog was very reactive to loud noises, jumping at every sudden sound. "

"The scientist studied the chemical composition of the soil sample. "

"In math class, we learned that an octahedron is a shape with eight faces. "

""During the war, the refugees lived in guarded compounds for their safety." "