1. One idea that Dalton contributed to modern atomic theory = …

Day 2 11-28

What does the inside of an atom look like, and how do we know?

Day 2 11-28

Dalton’s Atomic Theory (1800s):

1. All matter is composed of extremely small particles called atoms.

2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.

3. Atoms cannot be subdivided, created, or destroyed.

4. Atoms of different elements combine in simple whole-numbered ratios to form chemical compounds.

5. In chemical reactions, atoms are combined, separated, or rearranged.

Modern Atomic Theory:

1. All matter is composed of extremely small particles called atoms.

2. A GIVEN ELEMENT CAN HAVE ATOMS WITH DIFFERENT MASSES

3. ATOMS ARE DIVISIBLE INTO EVEN SMALLER PARTICLES.

4. Atoms of different elements combine in simple whole-numbered ratios to form chemical compounds.

5. In chemical reactions, atoms are combined, separated, or rearranged.

We have Atoms! - 1800’s

relative atomic weightsrelative atomic weightssymbolssymbols

Michael FaradayMichael Faraday realized that realized that _______________ is _______________ is somehow related somehow related to atoms and to atoms and chemical bonds.chemical bonds.

electricityelectricity

We have Atoms! - 1850’s • Cathode Ray Tubes

–Invented and studied in the mid-1800’s

–A beam of cathode ray particles . . .

• applies ________,

• makes the temperature of objects _________,

• and is affected by ___________ and ___________ fields.

forceforce

warmerwarmerelectricelectric

magneticmagnetic

We have Atoms! - 1850’s Cathode Ray Tubes

We have Atoms! - 1850’s Cathode Ray Tubes

We have Atoms! - 1872Dmitri Mendeleev

• Organized elements and “Father” of the __________ __________.

• Determined properties of elements that would be ______________ ______

Periodic Periodic TableTable

discovered in the discovered in the futurefuture

We have Atoms! - 1895 Wilhelm Röntgen

• Discovered that metals release mysterious waves when they are bombarded with _______ ____.

–These mysterious waves are called ________...

cathodecathode

X - raysX - rays

raysrays

We have Atoms! - 1895 Wilhelm Röntgen

X - raysX - rays

nonspontanenonspontaneousousturned turned ononand offand off

–These mysterious waves are called ________...

–These emissions are ______________ and can be _________

_______

We have Atoms! - 1896 Henri Becquerel

• Discovered that _______ ore can expose photographic film.

–This phenomenon is called ________.

–These emissions are __________, are __________, and ...

uraniumuranium

radiationradiation

spontaneousspontaneousalways “on”always “on”

We have Atoms! - 1896 Henri Becquerel

–This phenomenon is called ________.

–These emissions are __________, are __________, and ... _______________________________________.

radiationradiation

spontaneousspontaneousalways “on”always “on”

are NOT caused by an are NOT caused by an outside sourceoutside source

Day 3 11-29

How are X-rays different than radiation (you should be able to answer more than one way)?

Read pages 105-109 and answer #s 9-15 on page 109

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Day 4 11-30

What was Mendeleev’s contribution to Chemistry?

Day 5 12-3

Explain one way in which Dalton’s idea of an atom was incorrect.

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Click on the assignments tab and complete Practice Test 2. Anyone that improves their score from Friday will receive a bonus point.

Day 6 12-4

How did Thomson’s plum pudding model explain the structure of an atom (from book assignment)?

Go to usatestprep.com/Home and log in.

Click on the assignments tab and complete today’s assignments in the following order:

1st = Cell Growth Practice 12-42nd = Homeostasis Practice 12-43rd = Evolution Practice 12-44th = play the game corresponding to your lowest practice score

Anyone scoring a 7/10 or higher on all three practice assignments will receive a bonus point.

What does the inside of an atom look like, and how do we know?

Day 3 11-29

CLIPS

We have Atoms! – 1897 J. J. Thomson

• Studied _________ ______.

• All metals create _______________________.

• Cathode ray particles are _____ and _________ _________.

• Thomson coined the _______ as another name for ______ ___ _________.

cathode cathode raysrays

identical identical cathode rayscathode rays tinytiny

negatively negatively chargedcharged

electronelectron

particlesparticlescathode cathode ray ray

We have Atoms! – 1897 J. J. Thomson

solidsolidspheresphere

negative electronsnegative electronspositive positive surroundingssurroundings

• Atom’s appearance:

–______

–_______–Parts

•________________

•_______ ___________

Period 7 11-10

1. What 2 important things did the cathode ray tube prove about electrons?

2. Explain how an x-ray works. (use your book and/or notes if necessary)

Day 1 11-11-11

• Investigated _________ and its behaviors.

• The chemical properties of radioactive elements _______ as radiation is emitted.

radiationradiation

changechange

We have Atoms! – 1898Marie Skłodowska Curie and Pierre Curie

• Isolated and discovered the elements _________ and ________.

poloniumpoloniumradiumradium

We have Atoms! – 1898Marie Skłodowska Curie and Pierre Curie

Period 4 11-10

Use your jigsaw model and notes: Our atomic model was the first to …

Day 2 11-15-11

Jigsaw 10 minutes to write group notes!

Rest of the period to share with other groups.