Organization of the Periodic Table.

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Presentation transcript:

Organization of the Periodic Table

Why is the Periodic Table organized the way it is? Thanks to Dmitri Mendeleev!!! He put the chemicals and their properties on cards. He put them in order of their atomic weight.

Why is the Periodic Table organized the way it is? He found that some of the properties repeated periodically. He predicted some holes in the periodic table predict three new elements and a variety of their properties like their density. They were later discovered having similar properties to what Mendeleev predicted. Germanium, Gallium, Scandium

Making him the father of the Periodic Table!!!!

Organization Now Henry Moseley organized it by Atomic number The noble gases were discovered and added later with out messing up the organization.

Valence Electrons Valence Electrons: The outer most electrons in the s and p orbitals. Write the noble gas notations for all of the alkali metals. This works for all the groups!!

Valence Electrons How many valence electrons in – The halogens? – The boron group? – The alkaline earth metals? – The noble gases? Chemical reaction happen because of the valence electrons This is why elements in the same group behave similarly

Periodic Trends!!! Atomic Radii: half the distance between the nuclei of two atoms.

Atomic Radii The trend Why?

Ionization Energy The energy required to remove an electron. What do you think the trend is? Why?

Ionization Energy

Electronegativity The ability to attract an electron. What do you think the trend is? Why?

Electronegativity