Matter is made up of very small parts called atoms. Atoms can combine in different numbers and in different ways to make different molecules. Atoms and molecules make up all of the different ...

Which atoms make up most of the stuff in the universe? About 98% of the mass of the universe is made up of only two types of atoms: hydrogen and helium. That’s because these two elements make up stars ...

Two presenters use animations to show how protons, neutrons and electrons make up atoms. They explain the relative masses, sizes, locations and charges of these subatomic particles. Introduce ...

But in the early 1930s, scientists discovered that some atomic nuclei—the center part of atoms, which make up all matter—were ...

Explanation: Atoms are the smallest pieces of matter, they make up all of the elements and molecules and proteins and everything else on Earth. They also literally make up everything we see ...

"Our ideas for how to engineer novel materials by tailoring features at the nanoscale are maturing as a result of the ability ...