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22 Cards in this Set

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