Download KWL chart and chem notes

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 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
- MOST of the mass of the atom
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 moving
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)