Transcript Unit EQ: What is the difference btwn Physical and Chemical

Unit EQ: How is Periodic Table arranged?
Warm-up 9/27/10
 What does the word periodic/period mean
to you?
repeating in a predictable pattern
Open book to p158
 Get 3 colored pencils off education table

Unit EQ: How is Periodic Table arranged?
Three main classes of elements
Metal
metalloids
Then within those 3
18 groups (columns)
7 periods (rows)
non-metals
Unit EQ: How is Periodic Table arranged?
Mendeleev – 1869 (russian) arranged
elements according to atomic mass
He left blanks in table –predicted presence
of unknown elements – Awesome!
Lothar Meyer – a little late
Moseley – 1913 (british) made slight change
and arranged by atomic number
Unit EQ: How is Periodic Table arranged?
EQ: Why is Hydrogen in with Alkali metals?
Warm-up 9/28/10
1) What is group 2 called? Group 3-12?
2) What temp. does water boil? freeze?
Unit EQ:How is periodic table arranged?
Subatomic particles?
Warm-up 9/29/10
 How many protons, neutrons and electrons does
Carbon 12 and Carbon 14 have?
Test Next Thursday Oct 7th on History and parts of
atom
Read and take notes on chapter 4 and section 6.1

Calculating subatomic particles
Atomic number (Z)= # protons = # electrons
 Atomic Mass (A)– often average atomic
mass equal to # of protons plus # of
neutrons in nucleus
 Mass number = protons + neutrons for
specific isotope
 Isotope – atom of same element with
different # of neutrons and therefore
different mass numbers.

Video On History of Atom
9/29/10


Einstein and Bohr fight over atomic theory
Schrodinger and Heisenberg throw down
Atomic Theory
Democritus 400BC– Indivisible and indestructible
Dalton 1803– 1. Indivisible (wrong because fission –
splitting atoms and subatomic particles)
2. Atoms same element identical- (wrong b/c
Isotopes – atoms same element different mass)
3.combine in simple whole number ratios
4. React by combining, separating and
rearranging
Goldstein 1886 - proton
Thomson 1897- cathode ray tube- discovered
electrons – Plum pudding model
Atomic Theory Cont.
Rutherford 1911– Gold foil experiment
Discovered the nucleus and most of atom is empty
space
Bohr 1913– electrons occupy fixed orbits around
nucleus and can jump up or down by gaining or
losing energy
Millikan 1916 – found the quantity of charge of
electron and its mass 1/1840 of hydrogen atom
Chadwick 1932– neutron
Current model derived with crazy Math
Quantum Mechanical Model also electron
cloud model - dense central nucleus
surrounded by electrons in orbitals- areas of
high probability to find electron
Heisenberg uncertainty Principle- can not tell
the position and velocity of an electron
simultaneously
Unit EQ: Atomic History?
EQ: What is the atom made of?


How can you tell what a star is made up of?
Who helps us figure this out?
Test/Quiz Next Thursday Oct 7th on History and
parts of atom
Read and take notes on chapter 4 and section 6.1
