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Democritus 400 BC. Ancient Greek philosopher who thought that matter was made of small indivisible particles. He name them “atoms” which means indivisible in Greek. John Dalton 1830. Agreed with Democritus model of the atom and Added to Democritus idea.

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Democritus 400 bc

Democritus400 BC


Ancient Greek philosopher who thought that matter was made of small indivisible particles. He name them “atoms” which means indivisible in Greek


John dalton 1830

John Dalton of small indivisible particles. He name them “atoms” which means indivisible in Greek1830



Agreed with Democritus that matter was made of small indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphere


He created an atomic theory that consisted of 4 parts indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphere1) Chemical elements are made up of atoms. 2) The atoms of an element are identical in their masses. (Be sure students understand that this was shown to be false with the discovery of isotopes.) 3) Atoms of different elements have different masses. 4) Atoms only combine in small, whole number ratios such as 1:1, 1:2,


J j thomson 1897

J.J. Thomson indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphere1897


Found that atoms are divisible by discovering the electrons

Found that atoms are divisible by discovering the electrons indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphere


Used a cathode ray tube indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphereto discover electrons (negative particles)Thought the negative particles were mixed in the positive charge like raisins in plum pudding


Ernest rutherford 1908

Ernest Rutherford indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphere1908


Was a former student of j j thomson disproved his idea of the plum pudding model

Was a former student of J.J Thomson indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size spheredisproved his idea of the plum pudding model


Thought that the atom is mostly empty space. indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphere(football stadium model)discovered the nucleus by doing an experiment with gold foil


Niels bohr 1913

Niels Bohr indivisible particles. His model was the atom was tiny solid spheres. Each element had a different size sphere1913



Thought that electrons orbit the nucleus like planets orbit the sun. We still draw atoms like this today.


Electron cloud theory 1920 s

Electron Cloud Theory the sun. We still draw atoms like this today.1920’s


States that electrons don’t stay in fixed orbits. They can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade


First energy level can have 2 electrons can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one bladesecond can have 8third can have up to 18 (but it prefers 8) and the 4th can have up to 32


Protons

Protons can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade


Positive charge found in the nucleus weighs 1 amu atomic mass unit

Positive charge can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one bladefound in the nucleusweighs 1 amu (atomic mass unit)


Electron

Electron can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade


Negative charge can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one bladefound in the electron cloud surrounding the nucleustakes almost 2000 of them to weigh as much as one proton or neutron


Neutron

Neutron can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade


No charge neutral found in the nucleus weight one amu

No charge (neutral) can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one bladefound in the nucleusweight one amu


Atomic number

Atomic number can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade


Number of protons unique to each element

Number of protons can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one bladeunique to each element


Atomic mass

Atomic mass can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade


Number of protons and neutrons combined

Number of protons and neutrons combined can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade


Isotope

Isotope can move from one energy level to another. This model is more like a ceiling fan. You know were the blades are but you can pinpoint one blade



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