chem 4

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John Dalton

In a chemical reaction, atoms are separated, combined or rearranged

1/12 the mass of a carbon-12 atom

One atomic mass unit is...

false

true or false? Ancient philosophers regularly preformed controlled experiments.

true

true or false? Both Democritus and Dalton suggested that matter is made up of atoms.

true

true or false? Dalton thought that all atoms of a specific element have the same mass.

false

true or false? Daltons atomic theory stated that matter is mostly empty space.

true

true or false? Philosophers formulated explanations about the nature of matter based on their own expiriences

protons, electrons, and atomic number

what isotopes are all equal?

Rutherford

Proposed the nuclear atomic model

Thomson

Calculated the mass of an electron

mass number

sum of the atomic number and neutrons in the nucleus

Democritus

believed matter was made up of tiny individual particles called atomos

51 protons, 51 electrons, 72 neutrons

An isotope has an atomic number 51 and a mass number 123

John Dalton

Atoms are indivisible and indistructible

John Dalton

Atoms of a given element are identical in size, mass, and chemical properties.

John Dalton

Atoms of a specific element are different from those of other elements

isotopes

Atoms with the same number of protons but different numbers of neutrons are called isotopes

Millikan

Determined the mass-to-charge ratio of an electron

Democritus

Greek philosopher that was the first person to propose the idea that matter was not infinitely divisible.

Plum pudding model

J.J. Thomson proposed a model that did not last

John Dalton

Matter is composed of extremely small particles, called atoms

Aristotle

Matter is made of earth, fire, air, and water.

John Dalton

Revived and revised democritus' ideas based on the results of scientific research he conducted.

Democritus

Size, shape, and movement of atoms determine the properties of matter

neutron

Subatomic particle that has a mass nearly equal to that of a proton, but it carries non electric charge

133, 55 Cs

Symbolic notation of cesium-133

4,2 He

Symbolic notation of helium-4

22,10 Ne

Symbolic notation of neon-22

234,92 U

Symbolic notation of uranium-234

atomic number

The number of protons in an atom is referred to as the...

proton

a subatomic particle carrying a charge equal to but opposite that of an electron

Democritus

believed atoms could not be created, destroyed, or further divided.

Democritus

atoms are solid, homogeneous, indestructible, and indivisible

atomic mass unit

defined as 1/12 the mass of a carbon-12 atom

Aristotle

did not believe atoms moved through empty space

Aristotle

did not believe that empty space existed

John Dalton

different atoms combine in simple whole-number ratios to form compounds

Democritus

different kinds of atoms have different sizes and shapes

Democritus

his atomic theory was eventually rejected

atom

smallest particle of an element that retains the properties of the element is called an atom.

Democritus

matter is composed of atoms, which move through empty space

electron

negatively charged particles that are part of all forms of matter

atomic mass

part of an element that is the weighted average mass of the isotopes of that element

cathode ray

ray, originating from the cathode and traveling to the anode. A stream of negatively charged particles


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