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Atomic Radius
Decreases across a Period
Increases down a Group
Electron affinity
The attraction of an atom for an e⁻
Increases across a Period
Decreases down a Group
Ionization energy
The energy required to remove an e⁻ from an atom
Increases across a Period
Decreases down a Group
Electronegativity
The attraction of a bonded atom for an e⁻
Increases across a Period
Decreases down a Group
Ionic Radius
(mettalic) Cations are smalller than their original atoms
(non-metallic) Anions are larger than their original atoms
Florine
Most reactive Non-Metal
Cl has higher e⁻ affinity
Highest ionization energy
Highest electronegativity
Cesium
Most reactive Metal
Dobereiner
Discovered groups of three related elements
Tri-ad-s
Newlands
organized elements in order of increasing atomic masses
law of octaves every 8th properties element had similar repeating
Newlands-musical notes, octaves
Meyer
organized elements in order of increasing atomic masses
made an 8 column table of the elements
Made it uncool
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
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
Francium
Metal with
Lowest e⁻ affinity
lowest ionization energy
lowest electronegativity
by location