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Chemistry 4U > Atomic Theory Scientist (Question First) > Flashcards

Atomic Theory Scientist (Question First) Flashcards

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1
Q

Engaged in thought experiments → Start of the Atomic Theory

A

Democritus

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2
Q

Proposed idea that all matter is composed of atoms (tiny particles).

A

Democritus

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3
Q

“The Father of Modern Atomic Theory”

A

John Dalton

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4
Q

Inferred proportions of elements

A

John Dalton

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5
Q

Proposed that Oxygen and Hydrogen are components of water

A

John Dalton

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6
Q

First to discover electrons but had no explanation for it

A

William Crookes

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7
Q

Discovered the Electron and explained it (found charge and mass)

A

J.J Thomson

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8
Q

Showed that electrons were part of matter - the structure of the atom had mass

A

J.J Thomson

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9
Q

“Raisins in Pudding”

A

J.J Thomson

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10
Q

“The Father of the Nuclear Atomic Atom”

A

Ernest Rutherford

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11
Q

Made improvements to the atomic model in regard to the characteristics of the nucleus and where the mass is found

A

Ernest Rutherford

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12
Q

Discovered radiations could split into 3 types of beams with magnetic fields

A

Ernest Rutherford

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13
Q

“The Gold Foil Experiment”

A

Ernest Rutherford

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14
Q

Identified the Proton

A

Ernest Rutherford

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15
Q

Discovered Radioactivity

A

Henri Becquerel

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16
Q

Discovered Protons, but did not know what it is

A

Goldstein

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17
Q

Discovered the Neutron

A

Chadwick

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18
Q

Proposed that light was a particle

A

Newton

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19
Q

Proposed that light was a wave

A

Huygen

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20
Q

Proposed that light is an electromagnetic wave

A

James Maxwell

21
Q

Pioneered the field of the study of black bodies

A

Kerchhoff

22
Q

Studied “Black Bodies”

A

Max Plank

23
Q

Found a formula that treated light as if it was discrete, NOT continuous
(Treated the energy of the light in quantums of energy)

A

Max Plank

24
Q

Discovered the Photoelectric Effect

A

Heinrich Hertz

25
Q

Says light consisted of streams of Planck’s Quanta, and called them Photons

A

Albert Einstein

26
Q

Used Spectroscopy to understand spectral lines

A

Neils Bohr

27
Q

improvements to the characteristics of the electron

A

Neils Bohr

28
Q

Discovered bright line spectra (coloured lines) and absorption spectra (gases that absorb coloured lines) using gas discharge tube

A

Neils Bohr

29
Q

Suggested that light in discrete quantums are also only allowed certain energy levels

A

Neils Bohr

30
Q

only accurately predicts special line for only hydrogen

A

Neils Bohr

31
Q

Developed Spectroscopy in 1859

A

Robert Bunsen & Gustav Kirchhofft

32
Q

Discovered the Uncertainty Principle

A

Werner Heisenberg

33
Q

Used (devised) the Wave Equation (Wave Mechanics) to determine the probability of finding an atom’s electrons at a particular point within an atom

A

Erwin Schrodinger

34
Q

First Proposed that matter (particles) could have wave-like properties

A

Lous De Broglie

35
Q

“Father of Modern Chemistry”

A

Antoine Lavoiser

36
Q

Eye drop experiment

A

Milikan

37
Q

Principle - Electrons enter orbitals of lowest energy first

A

Aufbau

38
Q

Principle - No two electrons in the same atom can have the same set of quantum numbers

A

Pauli

39
Q

Rule - Electrons occupy orbitals of equal energy, one electron enters each orbital until all the orbitals contain one electron with parallel spin. Then the second electron then adds to each orbital so that their spin is paired and opposite in direction.

A

Hund

40
Q

the point of indivisibility

A

Atomos

41
Q

Changing one substance into another

A

Transmutation

42
Q

The range of frequencies (frequency of waves is continuous)

A

Electromagnetic Spectrum

43
Q

Energy from light in discrete/individual amounts/packets

A

Quantum

44
Q

Radiation is shone on a metal and results in flowing energy

A

Photoelectric Effect

45
Q

When white light is passed through a prism, it splits into its component colours

A

Spectroscopy

46
Q

Occurs when the electron emits a quantum of energy in the form of light equal to the change in energy level

A

Spectral Lines

47
Q

It is impossible to know both the position and the momentum of an object beyond a certain measure of precision (mathematically proved)

A

Uncertainty Principle

48
Q

Region of space where the electron is most likely to be found
Isoelectronic - Atoms which have the same electron arrangements

A

Orbital (Electron Cloud)

Chemistry 4U (2 decks)

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