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1

Atomos

smallest piece of matter, not to be cut, indivisible

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2

DEMOCRITUS

Believed that matter could not be divided indefinitely?

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3

Aristotle

Believed that matter could be divided into smaller and smaller pieces forever

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4

John Dalton

Proposed the hook and eye model of atom based on experimentation and not on pure reason; There are elements that can be easily combined/separated; Also believed that atom is the smallest unit

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5

Law of Conservation of Mass

atoms cannot be created nor destroyed

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6

atomic theory (1808)

all matter is made of atoms

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7

Hook and Eye Model of Atom

It is crucial for the successful interaction of two atoms.

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8

JOSEPH JOHN THOMSON

First proposed that atoms are divisible; Found that atoms could sometimes eject a far smaller negative particle, the electron, while working with a cathode ray tube

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9

1897

When was electron discovered?

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10

Corpuscles

The term before for electrons

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11

The Plum Pudding Model of Atom

JJ Thomson developed this model of atom

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12

negative electric charges (electrons)

The plums represented what?

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13

shapeless mass of uniform positive electrification

The pudding represented what?

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14

ERNEST RUTHERFORD

He introduced that the positive electrification mentioned by Thomson is a small dense center he named nucleus; He is considered the Father of Nuclear Physics; He also discovered the proton

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15

1911

When was nucleus discovered?

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16

1919

When was proton discovered?

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17

Nuclear Model of Atom

describes the atoms as containing a small, dense, + charged center, known as the nucleus, with - electrons orbiting a nucleus in set, predictable paths

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18

Ernest Rutherford

Who discovered the Nuclear Model of an Atom?

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19

Niels Bohr

A Danish scientist that proposed an improvement by placing each electron in a specific energy level

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20

1913

When did Niels Bohr proposed an improvement by placing each electron in a specific energy level?

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21

quantum of an energy

Electrons can move up a level if given enough energy. What is the so-called energy?

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22

quantum leap

Electrons can move up a level if given enough energy. What is the so-called movement of electrons?

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23

The Planetary Model of Atom

Electrons move in definite orbits around the nucleus, much like planets circle the sun . These orbits, or energy levels, are located at certain distances from the nucleus.

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24

Niels Bohr

Who proposed The Planetary Model of Atom?

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25

Erwin Schrödinger

An Austrian physicist that used mathematical equations to describe the likelihood of finding an electron in a certain position; Also introduced the concept of sub-energy levels (s,p,d,f...)

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26

Quantum Mechanical Model

Describes the likelihood of finding an electron in a certain position. This atomic model is known as the

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27

Electron Cloud Model

Other term for Quantum Mechanical Model

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28

1926

When was Quantum Mechanical Model proposed?

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29

James Chadwick

Who discovered the neutron? He was also awarded a nobel prize in physics for this discovery.

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30

Ernest Rutherford

Mentor of James Chadwick

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