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13 Cards in this Set
- Front
- Back
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What is the relative mass of an electron? |
1/2000 (negligible) |
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What are electrons held in place by? |
nuclear attractive force |
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What is the atomic number equal to? |
the number of protons in the nucleus of an atom |
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What is the mass number equal to? |
the number of protons and neutrons in the nucleus |
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What are isotopes? |
Are atoms of the same element with different numbers of neutrons |
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How are isotopes of the same element different? |
They have different masses They have different number of neutrons in the nucleus different physical properties |
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How are isotopes of the same element the same? |
same number of protons same number of protons as electrons same chemical properties |
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What are physical properties of an element? |
melting point boiling point conductivity |
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Why are the chemical properties of isotopes of the same element the same? |
chemical reactions involve electrons |
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What is relative isotopic mass? |
Themass of an atom of an isotope compared with 1/12th the mass of an atom of carbon-12. |
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What is relative atomic mass? |
The weighted mean mass of atom of an element compared with 1/12th of the mass of an atom of carbon-12. |
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What does the weighted mean mass take into account? |
The percentage abundance of each isotope relative mass of each isotope |
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What technique is used to determine information about isotopes including their mass number and relative abundance? |
mass spectrometry |
