Chem Index Card 4

Chem Index Card 4 - Group-vertical similar properties...

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Group -vertical similar properties Period -horizontal periodic law - increasing atomic # on periodic table representative elements - Group 1A through 7A noble gases -Group 0 Transition metals -Elements in Group 2A and 3A interrupted in periods 4 and 5 Inner Transition metals -Elements in Group 2A and 3A interrupted in periods 6 and 7. Alkali metals - Group 1A Alkaline Earth Metals - Group 2A Halogens Group 7A Periodic Table -arrangement of elements based on similarities in prop. *to find neutrons in each atom subtract atomic mass by atomic number NA=12 neu ~Isotope Mass X %abundance as decimal + Isotope Mass X %abundance=final answer in significant digits~ The idea of an atomic theory is more than 2000 years old. Democritus - everything was composed of small invisible particles called atoms. Greek-atomos. Empedoclus - contradicted theory said everything composed of 4 elements (earth,wind,fire,water) he was close friend to ( Aristotle )-Greek philosopher. *Transformation of a substance into one or more new sub. Is chemical reaction.
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Chem Index Card 4 - Group-vertical similar properties...

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