Element Research Project Robert Waller

Element Research Project

• Robert Waller

Radium

• Atomic Number: 88

• Atomic Mass: 226

• Number of:

• Protons- 88

• Neutrons- 138

• Electrons- 88

• Common Naturally Occuring Isotopes: 223Ra, 224Ra, 226Ra, 228Ra

• Atomic Mass Calculations:

• Radium 223 (mass=223.01850217)(abundance= 0%) = 0

• Radium 224 (mass=224.020211821)(Abundance= 0%) = 0

• Radium 226 (mass=226.025409823)(abundance= 0%) = 0

• Radium 228 (mass=228.031070292)(abundance= 0%) = 0

• * I wasn’t exactly sure how the atomic mass ended up at 226 if the abundance of all of the isotopes were 0.

• Electron Configuration: 1s2, 2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s2,4d10,5p6,6s2,4f14,5d10,6p6,7s2

• Abbreviated E.C. [Rn] 7s2

• Common Uses: Cancer radiotherapy, neuron source for research purposes, constituent of luminescent paints.

• How/Where/Who Discovered: Discovered by Marie and Pierre Curie in 1898 in Bohemia; the removed uranium from the pitchblend and found that the remaining material was radioactive.

• *Pictures on Next Slide*

Radium Pictures

Mendelevium

• Atomic Number: 101

• Atomic Mass: 258

• Number of:

• Protons- 101

• Neutrons- 157

• Electrons- 101

• Common Naturally Occurring Isotopes: 257Md, 258Md, 260Md – all have 0% abundance

• Calculations showing how atomic mass is found:

• Mendelevium 257 (mass= 257.095541368)(abundance=0%)

• Mendelevium 258 (mass= 258.098431319)(abundance=0%)

• Mendelevium 260 (mass= 260.103652)(abundance=0%)

• *Just like with Radium, I wasn’t sure how the atomic mass reached 258 with all of the isotopes having 0% abundance

• Electron Configuration: 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,4f14,5s2,5p6,5d10,5f13,6s2,6p6,7s2

• Abbreviated E.C.: [Rn] 5f13,7s2

• Common Uses: There are no known uses

• How/Where/Who Discovered: Albert Ghiorso,B.G. Harvey, G.R. Chopplin, S.G.Thompson and G.T.Seaborg. It was discovered in Berkley, California. Mendelevium is made by bombarding Einsteinium with helium ions. Almost no Mendelevium has ever been produced.

• *Pictures on next slide*

Mendelevium Pictures

Tellurium

• Atomic Number: 52

• Atomic Mass: 127

• Number of:

• Protons- 52

• Neutrons- 75

• Electrons- 52

• Common Naturally Occurring Isotopes: 120Te,121Te,122Te,123Te,124Te,125Te,126Te,127Te,128Te,129Te,130Te

• Atomic Mass Calculations:

• Tellurium 120 (mass= 119.904020222) x (Abundance= 0.09%) = 0.108

• Tellurium 121 (mass= 120.904936424) x (Abundance= 0%) = 0

• Tellurium 122 (mass= 121.903043898) x (Abundance= 2.55%) = 3.109

• Tellurium 123 (mass= 122.904270029) x (Abundance= 0.89%) = 1.093

• Tellurium 124 (mass= 123.902817896) x (Abundance= 4.74%) = 5.872

• Tellurium 125 (mass= 124.904430731) x (Abundance= 7.07%) = 8.830

• Tellurium 126 (mass= 125.903311696) x (Abundance= 18.84%) = 23.720

• Tellurium 127 (mass= 126.905226336) x (Abundance= 0%) = 0

• Tellurium 128 (mass= 127.904463056) x (Abundance= 31.74%) = 40.596

• Tellurium 129 (mass= 128.906598238) x (Abundance= 0%) = 0

• Tellurium 130 (mass= 129.906224399) x (Abundance= 34.08%) = 44.272

• = 127.6

• Electron Configuration: 1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,4d10,5s2,5p4

• Abbreviated E.C.: [Kr] 4d10 5s2 5p4

• Common Uses: Used to improve the machining quality of metal products and to color glass and ceramics. Also used in thermoelectric devices, vulcanization of rubber, percussion caps, battery plate protectors and electrical resistors.

• How/Where/Who discovered: Baron Franz Müller von Reichenstein in 1782 in Romania. Tellurium is a by-product of refining lead and copper

• *Pictures on Next Slide*

Tellurium Pictures

Works Cited

• www.google.com (For the pictures)

• www.environmentalchemistry.com (Orbital Diagram pictures, Electron Configurations, and How/Where/Who info.)

• www.ptable.com (All info associated with protons, electrons, neutrons, isotopes, and atomic mass.)

• www.webelements.com (For any additional info needed)

• www.dictionary.com (For any words I didn’t know)