KWL CHEMISTRY CHART- On a separate piece of paper make 3 columns- Label the columns as follows:

-1st column KNOW-2nd column WANT-3rd column LEARN

For 7 minutes SILENTLY answer the following questions in the KNOW column and fill out the WHAT YOU WANT TO KNOW in the WANT area:1- Explain how a chemical symbol is created.2- Describe the atom and its structure 3- Differentiate between sub atomic particles.4- Compare the evolution of the atom to something else in science that has evolved over time.

Naming ElementsChemical Symbols

-letter or pair of letters which is the abbreviation for an Element

-Everyone world wide recognizes this system- both naturally occurring and man made

EX- Ag= silver (Latin name)O= Oxygen (element name)

Structure of the AtomAtom

-smallest part of an element that retains the elements properties

- comes from Greek word atmos (uncuttable)- basic building block for ALL matter

EX- the element neon is made of ONLY neon atoms

NUCLEUSNUCLEUS-

-small positively charged (+) center of an atom-contains PROTONS and NEUTRONS

SUB ATOMIC PARTICLES3 sub atomic particles are:

PROTON, NEUTRON, ELECTRON

PROTONS- in the NUCLEUS- have a +1 charge (positive)- number of protons is unique for each element

NEUTRONS- in the NUCLEUS- NO CHARGE (electrically neutral)

SUB ATOMIC PARTICLES (CON’T)ELECTRONS

- Occupy the area around the nucleus- Has a -1 charge- In electron cloud

ATOMIC MODEL- The model of the ATOM we use TODAY has EVOLVED from ideas and work of many scientists

Today we use THE ELECTRON CLOUD MODEL- electron cloud is area AROUND the NUCLEUS- 100,000 times LARGER in DIAMETER than

NUCLEUS (electron MUCH larger in size)- cloud is SMALLER in MASS than a single proton

or neutron (electron MUCH less mass)