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Chemistry > Chapter 1,2 : Elements of the Periodic Table, Atomic Structure > Flashcards

Chapter 1,2 : Elements of the Periodic Table, Atomic Structure Flashcards

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1
Q

Robert Boyle element definition

A

An element is a substance that cannot be broken down chemically into simpler materials

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2
Q

Define law of conservation of mass

A

The law of conservation of mass states that matter is neither created or destroyed in the course of a chemical reaction

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3
Q

Atomic Number who

A

Moseley, x rays

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4
Q

Triads

A

Dobereiner, similar chemical properties, atomic weight of middle element midway between the other two

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5
Q

Law of Octaves

A

Newlands, order of atomic weight

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6
Q

Predicted modern periodic table

A

Mendeleev

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7
Q

Cathode Rays

A

Crookes, discharge tube

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8
Q

Electron (Charge to mass (e/m))

A

JJ Thomson, cathode rays were deflected in a magnetic field. Negative charge

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9
Q

Name electron

A

Stoney

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10
Q

Charge on electron

A

Millikan, oil drop experiment

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11
Q

Plum pudding model

A

Thomson

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12
Q

Nucleus

A

Rutherford, gold foil

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13
Q

Energy levels who

A

Bohr

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14
Q

Neutrons

A

Chadwick, bombarded berrylium

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15
Q

Atomic number definition

A

The atomic number of an element is the number of protons in the nucleus of an atom of that element

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16
Q

Mass number definition

A

The mass number of an element is the sum of the number of protons and the number of neutrons in the nucleus of an atom if that element

17
Q

Isotopes

A

Isotopes are atoms with the same number of protons but different numbers of neutrons

18
Q

Relative atomic mass definition

A

The relative atomic mass of an element is the average mass of an atom of the element relative to one twelfth the mass of an atom of carbon12

19
Q

Principle of mass spectrometer

A

Positively charged ions are separated on the basis of their relative masses when moving in an electric field

20
Q

Processes in a mass spectrometer

A

Vaporisation
Ionisation
Acceleration
Separation
Detection

Chemistry (16 decks)

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