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22 Cards in this Set
- Front
- Back
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Properties of the elements that repeat consistently across the periods, determined by electron configuration
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Periodic Properties
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Amound of pull the valence electrons feel from protons in the nucleus
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Effective Nuclear Charge (Z*)
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# of protons - # of sheilding electrons = ?
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Effective Nuclear Charge (Z*)
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The effective nuclear charge trend for going down a family is...
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stays the same
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Going across a period, the effective nuclear charge...
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Goes up, because protons increase while shielding electrons stays the same
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Size of an atom
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Atomic size
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Factors which affect the size of an atom and how they affect it
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1. effective nuclear charge
2. number of energy levels |
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Trend of atomic size going down a family
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Increases due to the adding of more energy levels
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Trend of atomic size going across a period
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Decreases due to energy level staying the same, while effective nuclear charge increases (more pull on valence electrons)
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Energy needed to move an electron
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Ionization Energy
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Factors which affect ionization energy and how they affect it
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1. Effective Nuclear Charge
2. Atomic Size |
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Trend of ionization energy going down a family
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Decreases (easier to remove) because size is bigger, so valence electrons are further away
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Trend of ionization energy going across a period
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Increases (harder to remove) due to effective nuclear charge increasing (more pull - more likely to attract electrons)
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Energy needed to add an electron (likeliness to gain)
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Electronegativity
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Factors which affect electronegativity and how they affect it
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1. effective nuclear charge
2. atomic size |
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Trend of electronegativity going down a family
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Decreases.. if size is bigger, less pull from nucleus
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Trend of electronegativity going across a period
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Increases due to effective nuclear charge being greater
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Size of an ion
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Ionic Size
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Why was periodic table developed?
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to organize elements in meaningful way
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How was Medeleevs scheme for listing elements different from that used in the modern periodic table?
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Mendeleev - increasing molar mass, while todays is increasing atomic number
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What relationship can be seen between an elements placement within a group and its electron configuration?
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elements in same group have same number of valence electrons
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Why did Group 8 not appear on the Mendeleev periodic table?
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Noble gases had not been discovered yet due to their inactivity
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