Vocabulary 2

Element: a substance that cannot be broken down any further into anything simpler.

Atom: the smallest particle of an element that has the same chemical properties as the element.



 Nucleus: an atom's dense center, where most of its mass is.

Electron: a negatively charged particle that moves around an atom's nucleus.

Proton: a positively charged particle inside an atom's nucleus.

Neutron: a particle with no charge inside an atom's nucleus.

Atomic Number: the number of protons in an atom.

Metal: any of a group of elements that conduct heat and electricity, is shiny and bendable.