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12 Cards in this Set
- Front
- Back
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What does a chemical reaction involve (in terms of the atoms)? |
Chemical reaction change only the way that the atoms are combined in compounds. The atoms themselves are unchanged. |
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What is the structure of atom? |
P+ and N are packed together in the nucleus while E- move in the large surrounding volume. |
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What are atomic number(Z)? |
- The # of P+ in an atom. -The # of P+ determines the identity of the elements. - Periodic table is arranged in order of atomic #'s. EX: H z=1 1 proton |
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What is mass number (A)? |
- Total # of P+ & N in an atom. - The # of N can vary. |
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What are isotopes? |
- Atoms of the same elements that have different # N. (same # of P+) |
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Define period. |
One of the 7 horizontal rows of elements in the periodic table. |
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Define group. |
One of the 18 vertical columns of elements in the periodic table. |
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Define main-group elements. |
An element on one of the two groups on the left or the six groups on the right of the periodic table. |
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Define transition metals. |
An element in one of the 10 smaller groups near the middle of the periodic table. |
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Define inner transition metals. |
An element in one of the 14 groups shown separately at the bottom of the periodic table. |
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Example of period. |
First period contains 2 elements: hydrogen & helium. |
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Example of group. |
f |
