Periodic Trends. Nuclear Charge Shielding Atomic Radius.

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Presentation transcript:

Periodic Trends

Nuclear Charge Shielding Atomic Radius

Nuclear Charge Charge of the atom

Increases(  ) Across Period

Increases (  ) Down Group

Periodic Trends Nuclear Charge Shielding Atomic Radius

SHIELDING Lower energy levels “shield” higher energy levels from full nuclear charge

NO CHANGE ACROSS PERIODS

Increases (  ) Down Group

Periodic Trends Nuclear Charge Shielding Atomic Radius

Size of the atom video

Decreases (  ) Across Period

Increases (  ) Down Group

IONS An atom or group of atoms that have a positive and negative charge Form when electrons are transferred b/w atoms

Cations Positively charged ion Form by losing electron(s) Smaller than original atom Metals

Anions Negatively charge ion Form by gaining electron(s) Larger than original atom Non-metals

PERIODIC TRENDS Ionic Radius Ionization Energy Electronegativity

IONIC RADIUS Size of the Ion

Decreases (  ) Across Period Cations smaller than anions- trend restarts with NM

Increases (  ) Down Group

PERIODIC TRENDS Ionic Radius Ionization Energy Electronegativity

Ionization Energy Energy requires to remove an electron video

Increases (  ) Across Period

Decreases (  ) Down Group

Ionization Energy 1 st ionization energy = 1 + charge ion 2 nd ionization energy = 2 + charge ion 3 rd ionization energy = 3 + charge ion.

PERIODIC TRENDS Ionization Energy Ionic Radius Electronegativity

Ability of an atom to attract electron(s) video

Increases (  ) Across Period

Decreases (  ) Down Group

Reactivity Metals Periods –  across Groups –  down Nonmetals Periods-  across Groups-  down

Which group is more ionic? More electronegative? – Alkali Metals and Alkaline-Earth Metals

WHY?