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elements - biorocks

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Elements • Simplest form of ma0er that is made up of one type of atom. • Over a 100 different elements have been discovered. • We believe there are only 118 different elements that can exist. • Elements are organized and grouped on a chart known as the periodic table.

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Page 1: Elements - BioRocks

Elements•  Simplestformofma0erthatismadeupofonetypeofatom.

•  Overa100differentelementshavebeendiscovered.

•  Webelievethereareonly118differentelementsthatcanexist.

•  Elementsareorganizedandgroupedonachartknownastheperiodictable.

Page 2: Elements - BioRocks

PeriodicTableofElements• DmitriMendeleev• RussianChemist• 1834‐1907• Createdoneofthefirstperiodictables.• Placed63elementsonhistablebyusingtheelement’satomicmass.

Page 3: Elements - BioRocks
Page 4: Elements - BioRocks

Mendeleev’sPeriodicTable

Page 5: Elements - BioRocks

HenryMoseley •  1887‐1915•  Englishphysicist

•  OrganizedtheelementssystemaScallybasedonthe#ofprotonsintheirnucleus.

•  Thustheelementsaregroupedbytheiratomic#today.

Page 6: Elements - BioRocks

ModernPeriodicTable

Page 7: Elements - BioRocks

ModernPeriodicTable

Page 8: Elements - BioRocks

SymbolizingtheElements

Carbon Sodium

Page 9: Elements - BioRocks

USlizingtheInformaSononthePeriodicTable

•  The#ofprotonsdeterminestheatomic#ofanatom.

•  Ontheperiodictablethe#ofprotonsisequaltothe#ofelectronsinanatom.Thereforeatomsontheperiodictablelackacharge.

•  #ofprotons+#ofneutrons=Atomicmass

Page 10: Elements - BioRocks

Isotopes•  Atomsofthesameelementwithavarying#ofneutrons,andthusavaryingatomicmass.

•  Isotopeshavethesame#ofelectronsandprotons.

•  Isotopeshavethesameatomic#.

•  SomeisotopesareradioacSve.

Page 11: Elements - BioRocks

IsotopesofCarbonCarbon‐12 Carbon‐14


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