potassium

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

"Letters are the elements of written language."

"The box contained old photographs. "

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

"The student derived the answer to the math problem from the formula. "

"The fish flashed its silvery scales as it jumped out of the water. "

"Nature never lies (i.e. tells untruths)."

"The librarian carefully unbound the old book so she could repair its damaged pages. "

"The bank's website uses an atomic operation to update account balances. "

"Zero, one, −1, 2.5, and pi are all numbers."

"The gardener used fertilizer to help the flowers in the garden grow bigger and stronger. "

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