Parts and pieces

PeopleLaws and Postulates

+ - huh?Experiment

sRadioactivi

ty

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Final Jeopardy

Final Jeopardy Category

Final JeopardyRutherford proposed the nuclear or "solar system" model, in which negatively charged electrons move around a tiny, massive, positively charged nucleus. This model replaced Thomson's plum-pudding model, in which positive and negative charges were

evenly distributed throughout the atom. Rutherford's gold-foil experiment (which showed that most alpha particles fired at a gold foil pass right through without deflection) led him to conclude that the atom is mostly empty space. The fact that a few of the positively charged alpha particles are deflected greatly indicated that a small part of the atom-the nucleus-contains all its

positive charge and most of its mass.Compare Rutherford's model of the atom to Thomson's model by drawing their models. Label all the parts. Explain Rutherford's experiment to develop his model. (Click 3 times for answer.)

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atom

The smallest particle of an element that retains the chemical identity of that

element

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XGa p+31 n039 e34 ?

70x-3

P+= no= X = e- =

31

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1, 0

What is the approximate atomic mass of a neutron and an electron, in amu?

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197 grams

How many grams of gold would I need to have 1 mole

of gold?

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Ion and Isotope

Unequal number of protons and electrons and a change in

neutrons

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democritus

Who discovered atomos

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Rutherford

Discovered the core of the atom is positive

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Dalton

Teacher who made 4 postulates

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Thomson

This person used cathode rays to create the plum pudding

model

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Rutherford

Called the core of the atom the nucleus

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Law of constant composition

The law where carbon dioxide always contains 73 percent oxygen by mass is an illustration of

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Plumb pudding model

A goo of positiveness with negative particles distributed

throughout

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Electrons are outside a positive nucleus (came up with the term nucleus for the first

time)Describes Rutherford’s model

of the atom

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A=mass Z= atomic number

In the model what does A and Z stand for?

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Radioactive source, Beta, Gamma, Alpha

What are a,b,c,d

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Spectral lines that indicated electrons traveled in specific orbits with specific # of

electrons.Bohr discovered

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The electron

Thomson (using a cathode ray ) discovered

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Ben Franklin

The scientist who first suggested that the structure of atoms is related to electricity was

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neutrons

Atomic number subtracted from Atomic mass

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electrons

What subatomic particle is equal to -3 if proton value is

three less.

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2+

This is a charge of an alpha particle

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Atomic number

An element's identity is based on its

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Strong force or strong nuclear force

The force that holds protons together

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Towards the positive plate

If electrically charged plates were placed above and below the cathode ray tube, in what direction, if any, would they

deflect a beam of cathode rays?

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From cathode to anode

In the cathode ray tube shown operating in Figure 3-1, what is the general direction of the cathode ray

beam? (hint: Cathode (-) and Anode (+))

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Helium atom with 2+ charge and mass of 4

Explain an alpha particle

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ANS: 210 = mass number of unknown + 4; mass number of unknown = 210 – 4 = 20684 = atomic number of unknown + 2; atomic number of unknown = 84 – 2 = 82Element 82 is lead (Pb), so the missing symbol is Pb

Balance the following nuclear equation and write the missing symbol.Po —>X + He

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24 protons and 28 neutrons 21 electrons

Using a periodic table, determine the number of protons, neutrons, and electrons in the ion .

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answer

Balance the following nuclear equation. Be sure to give the symbol, with superscript and subscript, for the missing nucleus or particle:

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Write a balanced nuclear equation for the beta decay

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Daily Double

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The Jeopardy champion!