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19 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Avogadro's Number |
6.022x10^23 |
To 3 characters |
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All atoms are indivisible, all atoms of one element are the same size and weight |
John Dalton |
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Discovered the electron; plum pudding model |
JJ Thomson |
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Atom has a positively charged central region surrounded by negatively charged electrons - famous gold foil experiment showed that atoms are mostly empty space |
Ernest Rutherford |
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Used quantum theory to explain why electrons could remain in certain allowed orbits without radiating energy - quantum model |
Neils Bohr |
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Atoms are composed of subatomic particles: protons, neutrons, and electrons Electrons exist outside the nucleus in a 'cloud' |
Modern view of the atom |
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How do electrons influence the behaviour of atoms? |
number and configuration |
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atom that carries electrical charge |
ion |
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atoms that have different numbers of neutrons |
isotopes |
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major elements that make up earth's crust |
oxygen, silicon, aluminum, iron, calcium, sodium, potassium |
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where is the atomic weight located? |
below the element symbol |
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what is the atomic number? |
the number of protons in an atom |
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Mole |
The amount of an element whose mass, expressed in grams, is numerically equal to its atomic (or molecular weight) |
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What is avogadro's number definition? |
The number of atoms in 1 mol of an element |
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Half of the distance between the centres of two atoms of an element that are just touching each other |
Atomic Radius |
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The amount of energy required to completely remove an electron from a gaseous atom |
Ionization Energy |
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The amount of energy released when an electron is added to a neutral atom or molecule to form a negative ion |
Electron affinity |
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the tendency of an electron to attract elements |
electronegativity |
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wlkn |
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