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20 Cards in this Set
- Front
- Back
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What is the underlying cause of periodic trends?
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variations in atomic stucture
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trends - electronegativity
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decrease from top to bottom
increase from left to right |
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trends - ionic size
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cations smaller than atom from which they form
anions larger |
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trends - first ionization energy
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decrease top to bottom
increase left to right (opposite atomic size) |
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how do ions form?
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electrons are transfered between atoms
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how is the periodic table organized?
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in order of increasing atomic number
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What are the trends among the elements for atomic size
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increase top to bottom
decrease left to right |
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how did chemists begin to organize the known elements
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They used the properties of the elemtents to sort them into groups
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how did Mendeleev organize his periodic table?
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in order of increasing mass
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What are three broad classes of elements?
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metals, nonmetals, metalloids
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What type of info can be displayed in a periodic table?
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symbol and names of elements and info about the structure of the atom
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How can elements be classified based on their electron configuration?
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noble gasses, representative elements, transition metals, innertransition metals
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What is flourine's electronegativity value
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4.0
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State the trends for atomic size in groups and periods
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increases as down
decreases as across |
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hallogen valence electron configuration
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ns^2 n p^5
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What metal is not solid?
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mercury (Hg)
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Why is silicon an important metaloid?
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silicon chips used in computers
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Which nonmetal is a liquid?
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Bromine
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Noble gasses are also called...
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inert gasses
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Why didn't medeleevs periodic table work
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since there were isotopes, the atomic mass for a single element wasn't constant
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