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14 Cards in this Set
- Front
- Back
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What is in the Nucleus? |
Protons and Neutrons |
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What is the relative mass of an electron? |
1/2000 |
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How many electrons can the first, second and third electron shells hold? |
1st: 2 2nd:8 3rd: 8 |
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When are atoms most happy? |
When they have full shells. |
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What do elements consist of? |
One type of atom. |
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What is the Atomic Number? |
Number of protons in the Atom. |
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How do you find the number of neutrons? |
Mass Number - Atomic Number |
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What is an isotope? |
An element with one or more neutrons only. |
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Give an example of an isotope. |
Carbon -14 and Carbon -12 |
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How did the scientists in the 18oo's order the elements? |
Ordered by Atomic Mass/ |
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How did Mendeleev arrange elements? |
In grops, according to their properties. |
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What elements did Mendeleev's table help predict? |
Gallium and Germainium |
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What is group 1? |
Alkali Metals. |
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Name group 2,7 and 0. |
2 - Transition Metals 7- Halogens 0 - Noble Gasses |
