Subatomic Particles Unit 3

Atom

Smallest unit of an elementary that retains the properties of that element

Nucleaus

-made up of protons AND neutron

-makes up almost all the mass in an atom

-smallest part of an atom

Proton

-positively charged

-in the nucleus

-determines the atomic number

-1 AMU

Neutron

-neutrally charged

-in the nucleaus

-1 AMU

Electron

-located in the electron cloud

-negatively charged

-make sup most of the volume in an atom

-0 AMU

AMU(atomic mass unit)

-atoms are too small for grams

-1 amu is 1/12 of the mass of the carbon-12 atom

Counting Subatomic Particles