neutrons

"There will be a charge of five dollars."

"Clouds were forming interesting shapes in the sky. "

"The combination of soft music and warm lighting created a relaxing atmosphere in the living room. "

"I have a house and a car."

"The number of protons in an atom's nucleus defines what element it is. "

"The birthday balloons were filled with helium, which made them float to the ceiling. "

"The box contains my old toys. "

"The scientist studied the tiny particle of dust. "

"The nucleus of the family's discussions was always about who would do the dishes. "

"Protons and neutrons, which make up the nucleus of an atom, are themselves made of even smaller particles called quarks. "

"Scientists use powerful microscopes to study the behavior of subatomic particles inside atoms. "

"Protons and neutrons, the building blocks of atoms, are made of quarks. "