Atom

__**Proton**__: Positively charged, in the nucleus __**Neutron**__: Neutrally charged, in the nucleus __**Electron**__: Negative charge, orbits the nucleus
 * __Atom__**: The smallest part of an element having the chemical properties of the element.

__**Atomic Number**__: the number of protons in the nucleus (equal to the number of electrons) __**Atomic Mass**__: the atomic number plus the number of neutrons.

__**How to find the number of protons/electrons in and atom**:__ Atomic Number=19 Atomic Number=# of protons/neutrons 19=# of protons/neutrons

__**How to find the number a neutrons in an atom**:__ 1.Find the atomic mass 2.Round it up or down- to the nearest whole number. 39.098-->39 3.Subtract the Atomic Number from the Atomic mass 39 __-19__ 20 4.The difference is your # of neutrons.