KWL CHEMISTRY CHART - On a separate piece of paper make 3 columns - Label the columns as follows: -1 st column KNOW -2 nd column WANT -3 rd column LEARN.

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Presentation transcript:

KWL CHEMISTRY CHART - On a separate piece of paper make 3 columns - Label the columns as follows: -1 st column KNOW -2 nd column WANT -3 rd 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 Elements Chemical 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 Atom Atom -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

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

SUB ATOMIC PARTICLES 3 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)