Vocabulary #2 Elements and Atoms

1- element: a substance that cannot be broken down any further into anything simpler.

2- atom: the smallest particle of an element that has the same chemical properties as the element.

3- nucleus: an atom´s dense center where most of its mass is.

4-electron: a negatively charged particle that moves around an atom´s nucleus.

5- proton: a positively charged particle inside an atom´s nucleus.

6- neutron: a particle with no charge inside an atom´s nucleus.

7- atomic number: the number of protons in an atom.

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