sodium

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

"The teacher's encouragement helped enhance the students' confidence. "

"Letters are the elements of written language."

"The weight of the textbooks in my backpack felt heavy. "

""The cleaning solution contained a strong alkali, so we had to wear gloves to protect our skin." "

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

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