Chapter 5

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13 Terms

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Atomic Radius

Decreases across a Period

Increases down a Group

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Electron affinity

The attraction of an atom for an e⁻

Increases across a Period

Decreases down a Group

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Ionization energy

The energy required to remove an e⁻ from an atom

Increases across a Period

Decreases down a Group

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Electronegativity

The attraction of a bonded atom for an e⁻

Increases across a Period

Decreases down a Group

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Ionic Radius

(mettalic) Cations are smalller than their original atoms

(non-metallic) Anions are larger than their original atoms

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Florine

Most reactive Non-Metal

Cl has higher e⁻ affinity

Highest ionization energy

Highest electronegativity

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Cesium

Most reactive Metal

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Dobereiner

Discovered groups of three related elements

Tri-ad-s

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Newlands

organized elements in order of increasing atomic masses

law of octaves every 8th properties element had similar repeating

Newlands-musical notes, octaves

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Meyer

organized elements in order of increasing atomic masses

made an 8 column table of the elements

Made it uncool

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Mendeleev

organized elements in order of increasing atomic masses

His table was the basis of the modern periodic table

grouped elements with similar characteristics in the same column

8 column table of elements

predicted unknown elements properties

Periodic Law- the properties of the elements are a periodic function of their atomic masses

Made everything

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Mosely

arranged elements in order of increasing atomic number NOT MASS

Modern Periodic Law- the properties of the elements are a periodic

function of their atomic numbers

Modern Mosely

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Francium

Metal with

Lowest e⁻ affinity

lowest ionization energy

lowest electronegativity

by location