Electron
Substance
Atom
Proton
Periodic table
Nucleus
Neutron
Molecule
Element
Particle
A table that organizes all elements on Earth.
The smallest part of matter that has all the properties of its element.
Positive-charged particle in the atom's nucleus.
A tiny part of matter.
The center of an atom.
Two or more atoms connected together.
A particular type of matter that has the same properties, such as wood, plastic, water, or air.
A substance made entirely of one kind of atom, like hydrogen or helium.
Particle without charge in the atom's nucleus.
Negative-charged particle found in the outer shells of an atom's nucleus.