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7 Cards in this Set
- Front
- Back
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State 3 facts of atomic theory |
All matter is made up of tiny particles called atoms Atoms are tiny, hard spheres that can't be broken into smaller particles Atoms can't be created or destroyed Atoms in an element are all identical |
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Statr two atomic structures |
Atoms consists of a nucleus containing protons & neutrons The nucleus is aurrounded by electrons in an electron shell The particles have very small masses and charges |
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Subatomic particles: relative charge: Proton Neutron Electron |
Subatomic particles: charge: Proton +1 (positive) Neutron 0 (no charge) Electron 1 (negative) |
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Subatomic particles: relative mass: Proton NeutronElectron |
Subatomic particles: relative mass: Proton 1Neutron 1Electron 1/1835 or 0.0005 |
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Atoms in elements have... |
Equal number of protons & electrons |
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Why do atoms have no overall charge |
Because the number of positive protons and negative electrons balanve it out so its neutral |
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Most of the mass of an atom is concentrated in its... |
Nucleus |
