Periodic Table Groups
Most abundant element in the universe and also the lightest.
Hydrogen Group
The distance from the center of the atoms nucleus to its outermost electron
Atomic Radius
Atoms can either acquire or donate what
Electrons
One of the first to discover groups of elements with similar properties
Johann Dobereiner
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Hydrogen
This groups Chemical properties include 2 electrons in its outermost s sublevel when it combines with a nonmetal element.
Alkaline-Earth Metals
define anions
ions that have resulted from a gain of electrons
the radii of atoms decrease in size from which directions
Left to right
Associated with Law of Octaves
John Newlands
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Krypton
Are very chemically reactive and have electron configurations with one valence electron
Alkali Metals
what is Ionization energy
The amount of energy required to remove an electron from an atom
What is the trend of ionization energies
increase from left to right across a period
Developed the Periodic Table
Mendeleev
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Titoluwani Ayomide Ehinmowo
This group includes the Actinoid and Lanthanoid series
Inner transition Metals
What is electronegativity
The measure of the attraction between the nucleus and shared valence electrons
What must be done to remove an electron
work must be done to overcome the attractive forces that hold the electron in the atom
Formulated the atomic theory
John Dalton
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Akio Toyoda
The most chemically uniform group of elements other than the noble gases
Halogens
What is electron affinity
The opposite of ionization energy or the change in energy when an electron is added to a neutral atom to form an anion
What is the trend in ionic radius
Decreases across the period and increases down the group
suggested the solution to the apparent problem to the periodic table
Henry Moseley
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TBD