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Definition
Developed the word
ATOMOS - Indivisible matter.
No matter how many times you break up matter, it is still the same. |
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| First to categorize elements. |
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Term
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Definition
1. Elements are composed of small particles called ATOMS
2. All atoms of a given element are identical. Same size, mass and chemical properties and different from the atoms of all other elements.
4. Compounds are composed of atoms of more than one element.
5. A chemical reaction involves the separation, combination or rearrangement of atoms - not creation or distruction. |
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"Plum Pudding Version"
Atoms are positively charged pieces of matter with negative electrons floating in it. |
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| Emission and transmission of energy thru space in the forms of waves. |
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| 3 Types of rays emitted by radioactive elements |
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Definition
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Definition
1. The nucleus is made up of Protons and Neutrons
2. Electrons take up the rest of the space |
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Term
Rutherfords Design
(Gold foil / particle emitter) |
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Definition
1. Atom's positive charge is concentrated in the nucleus
2. Protons (+) have the opposite charge of electrons (-)
3. The mass of P is 1840 x the mass of e- |
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Progression of Atom Models
Democritus |
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Definition
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Progression of Atom Models
Dalton |
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Definition
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Progression of Atom Models
Thompson |
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Definition
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Progression of Atom Models
Rutherford |
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Definition
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Progression of Atom Models
Bohr |
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Definition
Bohr Model
(Quantized Orbitals) |
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Progression of Atom Models
Heisenberg-Schrodinger |
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Definition
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Term
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Definition
A=Mass # (Protons + Neutrons)
Z=Atomic # (Protons)
X=Element |
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Definition
Atoms of the same element with different number of neutrons in their nuclei.
(Found in nature) |
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| A union of 2 or more atoms in a definite arrangement held together by a chemical bond. |
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| An atom or group of atoms that contain a charge (+ or -) |
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Definition
A positively charge ion.
If a neutral atom loses 1 or more electrons, it becomes a cation. |
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Definition
An ion with a negative charge.
If a neutral atom gains 1 or more electrons, it becomes an anion. |
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Definition
| Distinct substances that contain 2 or more elements chemically combined in definite proportions by mass. |
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| Contains more than 2 atoms in different proportions |
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| 7 Diatomics Found in Nature |
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Definition
BRINCLHOF
Br2 I2 N2 Cl2 H2 O2 F2 |
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Definition
Contains only 1 atom
ie: NA+ Cl- CA2+ O2- |
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Definition
Contains more than on atom
ie: OH- CN- NH4+ |
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Simplest formula - shows the smalles whole # ration of the atoms in a compound.
ex:
O
CH2O
NH2 |
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Definition
Shows the exact # of atoms of each element present in one molecule of a compound.
ex:
O3
C6H12O6
N2H4 |
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