Atomic Theory Matter is composed of tiny building blocks, or particles, called ATOMS. Atoms are composed of three types of subatomic particles: PROTONS, NEUTRONS, and ELECTRONS. LecturePLUS Timberlake

Subatomic Particles Particle Symbol Charge Relative Mass Electron e- -1 0 Proton p+ +1 1 Neutron n 0 1 How big are electrons compared to protons and neutrons? See Scaling the Universe: http://primaxstudio.com/stuff/scale_of_universe/ LecturePLUS Timberlake

Location of Subatomic Particles Protons and neutrons are located in the atom’s NUCLEUS. Electrons are found in a cloud surrounding the protons and neutrons. How far away are the electrons? LecturePLUS Timberlake

How many types of atoms are there? LecturePLUS Timberlake

Did I Get It? All matter that exists in the universe is made up of _________________, which are the smallest units of matter. 2. The different types of ________________ are called ____________________. We know of about 118 of these, and we keep track of them in the _____________________________________________. LecturePLUS Timberlake

How to read the Periodic Table Pick one of the boxes from the Periodic Table of Elements, and re-draw it here. LecturePLUS Timberlake

Atomic Mass on the Periodic Table 11 Na 22.99 Atomic Number Symbol Atomic Mass LecturePLUS Timberlake

Elements Atoms of the same type can combine to form ELEMENTS. Au atoms combine to form gold Ag atoms combine to form silver LecturePLUS Timberlake

Atoms and molecules Single atoms can share or trade electrons to form BONDS. Two or more atoms bonded together is called a MOLECULE Atom Bond Molecule LecturePLUS Timberlake

Where are all the Elements organized into one handy place? LecturePLUS Timberlake