Atom & Cathode Ray Experiment – Chemistry

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Cathode Ray Tube, Plum Pudding Model, Cathode Ray Experiment, Atom

The key terms of this Chemistry chapter include Atom, Nucleus, Electron, Proton, Neutron, Plum Pudding Model, Cathode Ray Experiment.


Nucleus

an atom’s central region, which is made up of protons and neutrons


Proton

A subatomic particle that has a positive charge and that is found in the nucleus of an atom


Neutron

A subatomic particle that has no charge and that is found in the nucleus of an atom


James Chadwick

Discovered the neutron


Democritus

The first to suggest atoms existed


Dalton

Suggested all of the atoms of the given element were exactly alike, and atoms of different elements can join to make compounds


law of definite proportions

a chemical compound contains the same elements in exactly the same proportions by weight or mass


J.J Thompson

discovered the electron


J.J Thompson’s model

Cathode Ray Tube


What did the cathode ray experiment discover?

Cathode rays were made if negatively charged particles that come from inside atoms


Electron

A subatomic particle that has a negative charge


Cathode Ray Tube

A near airless tube connected to a battery in which electricity passed from the negative cathode to the positive anode.


Plum Pudding Model

Electrons were spread throughout the atom like blueberries in a muffin


What did the plum pudding model suggest?

the atom is a ball of positive charge with negative electrons embedded in it


Ernest Rutherford

discovered the nucleus, and the nucleus had a positive charge


Gold Foil Experiment

alpha particles that were shot at gold foil were deflected when they hit the positive center of gold atoms. The nucleus was discovered as a result of this experiment.


Nucleus

an atom’s central region, which is made up of protons and neutrons


Proton

A subatomic particle that has a positive charge and that is found in the nucleus of an atom


Neutron

A subatomic particle that has no charge and that is found in the nucleus of an atom


James Chadwick

Discovered the neutron


Democritus

The first to suggest atoms existed


Dalton

Suggested all of the atoms of the given element were exactly alike, and atoms of different elements can join to make compounds


law of definite proportions

a chemical compound contains the same elements in exactly the same proportions by weight or mass


J.J Thompson

discovered the electron


J.J Thompson’s model

Cathode Ray Tube


What did the cathode ray experiment discover?

Cathode rays were made if negatively charged particles that come from inside atoms


Electron

A subatomic particle that has a negative charge


Cathode Ray Tube

A near airless tube connected to a battery in which electricity passed from the negative cathode to the positive anode.


Plum Pudding Model

Electrons were spread throughout the atom like blueberries in a muffin


What did the plum pudding model suggest?

the atom is a ball of positive charge with negative electrons embedded in it


Ernest Rutherford

discovered the nucleus, and the nucleus had a positive charge


Gold Foil Experiment

alpha particles that were shot at gold foil were deflected when they hit the positive center of gold atoms. The nucleus was discovered as a result of this experiment.


Nucleus

an atom’s central region, which is made up of protons and neutrons


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