Chemistry - Atoms

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44 Terms

1
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<p>What does number 1 represent?</p>

What does number 1 represent?

Atomic Number

2
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<p>What does the letter “H” represent?</p>

What does the letter “H” represent?

Chemical Symbol

3
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<p>What does “Hydrogen” represent?</p>

What does “Hydrogen” represent?

Name

4
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<p>What does 1.008 represent?</p>

What does 1.008 represent?

Atomic Mass

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Atomic Mass

The number of protons + the number of neutrons

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Atomic Number

the number of protons OR the number of electrons in an neutral atom

7
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Isotopes

atoms of the same element w/ different number of neutrons

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What changes in isotopes

MASS and MASS ONLY

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<p>the “A”</p>

the “A”

Mass Number

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<p>the “Z”</p>

the “Z”

Atomic Number

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<p>the “X”</p>

the “X”

Chemical Symbol

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Average Atomic Mass

The average mass of all of the isotopes of an element

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<p>the “E”</p>

the “E”

Charge (electric charge)

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You find the neutrons how?

Mass Number - Atomic Number

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Element

substance made up of only one type of atom, each with the same number of protons.

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Atom

The smallest part of a substance that cannot be broken down chemically

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Isotope

An element where the atom have the same number of protons but w/ different number of nuetrons

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Ion

is an atom or molecule that is charged due to a difference in number of electrons and protons.

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Cation

Positive charged atom

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Anion

Negative charged atom

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Where is a proton located (inside or outside the nucleus)?

Inside

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Where is a neutrons located (inside or outside the nucleus)?

Inside

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Where is a electron located (inside or outside the nucleus)?

Outside

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Protons charge

Positive

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Neutrons charge

Neutral

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Electrons Charge

Negative

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Protons relative charge?

1

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Neutrons relative charge?

1

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Electrons relative charge?

Negligible

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What’s the atomic number determined by?

Protons

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What’s the mass number determined by?

Neutrons and Protons

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What’s the charge determined by?

protons - electrons

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What does the atomic number identify?

Element

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What does the mass number identify?

The mass

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What does the charge identify?

atom (charge = 0; p = e)

ion (charge doesn’t = 0; p doesn’t = e)

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400bc

Democritus

Atomos

Shape = Behavior

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200bc

Aristotle

4 Elements

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1789

Lavosier

Law of Conservation of Mass

39
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1803

John Dalton

Solid Sphere

Everything’s made of indestructive spheres

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1897

JJ Thompson

Plum Pudding

Showed atoms have smaller parts

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1911

Ernest Rutherford

Alpha Beta Gamma Rays

Gold-Foil Experiment

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1912

Henry Mosely

Atomic Mass

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1913

Neil Bohr

Planetary

Everythings a circle w/ a positive center

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1926

Erwin Schrodinger

Cloud of Electrons