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7 Cards in this Set
- Front
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Where in the Periodic Table do you find: 1. The Halogens 2. The Noble Gases 3. The Alkali Metals 4. The Transition Metals |
1. Group 7 2. Group 8/0 3. Group 1 4. Third Column - Twelfth Column |
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How does the group number link to the amount of electrons? Give an example. |
The group number shows how many electrons are on the outer shell. For example, the Halogens (group 7) have seven electrons on the outer shell. |
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How does the amount of electrons on the outer shell affect the reactivity? |
The amount of electrons on the outer shell affects the reactivity because it determines how many electrons need to be gained or lost. For example, the alkali metals are quite reactive because they need to lose one electron in order to have a full outer shell. |
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A grouping of one or two atoms bonded together is called a... |
Molecule |
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Find the word to replace the symbol. One of the first suggestions for a periodic table came from *. He arranged the elements in order of their •, which had been measured in various chemical reactions. In #, he published a table of elements in his book A System of Chemical Philosophy. |
* = John Dalton • = Atomic Weights # = 1808 |
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Find words to replace the symbols. In 1864, * built on Dalton’s ideas. Newlands also arranged the known elements in order of mass but noticed that the properties of every • element seemed similar. He produced a table showing his £. However, he assumed that all the elements had been \. He did not take into account that chemists were still discovering new ones. So he filled in his octaves, even though some of his elements were not similar at all. His table only really worked for the known elements up to calcium, before the pattern broke down. Other scientists ridiculed his ideas and % to accept them. |
* = John Newlands • = Eighth £ = ‘Law of Octaves’ \ = Found % = Refused |
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Find words to replace the symbols. In *, the Russian chemist • cracked the problem with Newland’s table. At this time around 50 elements had been identified. Mendeleev arranged all of these in a £. He placed them in the order of their \. He arranged them so that a periodic (regularly occurring) pattern in their properties could be seen. He left gaps for elements that had not yet been @. Then he used his table to predict what their properties should be. A few years later, new > were discovered with properties that closely matched Mendeleev’s predictions. Then there were not many } left that his table was a breakthrough in scientific understanding. |
* = 1869 • = Dmitri Mendeleev £ = Table \ = Atomic Weights @ = Discovered > = Elements } = Doubts |
