Atoms

What does an atom looks like?

Aluminum Activity

How big is an atom?

Aluminum Activity

On a piece of paper:1. Write ‘Aluminum Activity’ at the top

2. If the diameter of one Al atom is 2.5x10-8 cm, how many atoms thick is a piece of aluminum foil? • Get together with your cheese-it group from day

1. Make a guess as to how many atoms thick a piece of aluminum foil is.

• Write the number on your sheet as a ‘hypothesis’

You have 30 minutes:

1. Write a basic procedure for your experiment

2. Record all of your data, calculations in detail, and answer

Write your final answer on the board

3. Explain the error in your answer and where there is room to improve your lab

Elements To Know

On page 51 in the

book

Homework

• Your homework:– Make flashcards for elements in Table 3.3– QUIZ FRIDAY

• Name• Symbol• Approximate Location on Table

Unit 1 Test Results

Originally out of 85– Large number missed 9– Large number missed 2– Sig Figs on number 16

Test is now out of 80

Old score: 75/85

New score: 75/80

•Average: 62/80 = 78%•Median: 66/80 = 83%

Unit 1 Test Results

Results

A B C D F0

5

10

15

20

25

30

35

40

45

50

Unit 1 Test Grades

Grade

Nu

mb

er o

f S

tud

ent

Pap

ers

Test Corrections

• Separate Assignment– EVERYONE completes the corrections

• On a separate sheet of paper for each missing question:– What is the correct answer– Explain the correct answer or explain where

you made a mistake

• If you finish:– Staple your new work to the front of your test and put

in the ‘done’ bin

• If you DON’T finish:– Staple your new work to the front of your test and put

in the ‘need more time’ bin

• You will NOT be given more time in class to work. Turn in test before you leave

• Test Corrections due: Friday by 7:30 am

Test Corrections

http://www.youtube.com/watch?v=ssaUusY6hWM&feature=related

Logical Ordering

I need 3 volunteers

History

Dmitri Mendeleev 1896

1951 - SeaborgDeveloped the modern periodic table

The Whole Periodic table

Groups vs. Periods

Need to Know:

Halogens

Noble Gas

Alkali Metals

Alkali Earth Metals

Transition Metals

Lanthanides

Actanides Groups: Up and Down

Periods: Left to Right

Metals vs. Non-metals

Metals Metalloids Non-Metals

Form Generally solid, some liquid at room temp

Solid Generally gas

Conductivity High to moderate Moderate Poor

Density generally High Moderate Low

Examples Copper, Sodium, Silver, Gold

Boron, Germanium, Arsenic

Hydrogen, Helium, Neon

Location of Metalloids

Periodic Table

Atomic Number

Atomic Mass

Name

Symbol

**Mass Number can not be found on the periodic table

Number of protons

Average Mass of an Atom

Natural State of an Element

Diatomic Elements

Monatomic Gases

Liquids

Solids

Gases