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Strontium
Strontium
The atomic number for the element Strontium
is 38.
Strontium’s Atomic Symbol is Sr.
History
• Strontium was discovered by Adair Crawford in
1790 as he was studying the mineral witherite
(BaCO 3). It was isolated by Davey by
electrolysis in 1808.
• Strontium is named after the town Strontian in
Scotland.
Where is it found?
Strontium is found in nature in the form of
minerals. Coal, rocks, dust, soil, oil, surface and
underground water, plants, air, and animals all
contain varying amounts of Strontium.
Uses
Strontium is mostly used in the manufacturing
of color television picture tubes. This element is
also used to refine the element Zinc. Magnets can
be formed when Strontium is combined with Iron.
The red flame produced by Strontium carbonate
and Strontium nitrate is used in fireworks and
signal flares.
Strontium compounds are used in making
ceramics and glass products, pyrotechnics, paint
pigments, fluorescent lights, medicines, and other
products.
Three interesting Facts
•
Strontium ninety is the most hazardous of
the radioactive isotopes of the chemical element
strontium.
• Food and drinking water are the largest sources
of exposure to Strontium.
• Strontium behaves like calcium when it is in a
body.
Strontium
Strontium
Electron arrangement
Strontium
•
Sources
Agency for Toxic Substances and Disease Registry. ATSDR-Public Health Statement:
Strontium. Jan 30. 2007. <http://www.atsdr.cdc.gov/toxprofiles/phs159.html>
Bentor, Yinon.Chemical Element.com - Strontium. Jan. 30, 2007
<http://www.chemicalelements.com/elements/sr.html>
Thomas Jefferson National Accelerator Facility – Office of Science Education. It’s
Elements- The Element Strontium. Jan 30.2007.
http://education.jlab.org/itselemental/ele038.html
Los Alamos National Labs Chemistry Division. Strontium. Jan 30.2007.
<http://periodic.lanl.gov/elements/38.html>
Ytterbium
The atomic number for Ytterbium is 70.
The atomic symbol for the element
Ytterbium is Yb.
History
Ytterbium was discovered by Jean de
Marignac in 1878. Marignac believed that
ytterbia was a compound of a new element.
Marignac named this compound ytterbium.
Ytterbium is named after the village of “Ytterby”
near Vaxholm in Sweden.
Uses and Where it is
found
Ytterbium occurs rarely and it is recovered
commercially from monazite sand (sand
contains 0.03% of ytterbium). Ytterbium is
used in improving the grain refinement,
strength, and other mechanical properties of
stainless steel. An isotope of ytterbium was
used as a radiation source substitute for a
portable X-ray machine where the electricity
was not available. Very few uses have been
found for this element.
Three interesting facts
 A Kg of ytterbium is valued at $875.00
 Ytterbium has an atomic radius of 194 pm
 Ytterbium has a density of 6.90 grams per
cubic centimeter
Ytterbium
Ytterbium
Electron arrangement
Ytterbium
Sources
Los Alamos National Labs Chemistry Division. Strontium.
Jan 31.2007. <http://periodic.lanl.gov/elements/38.html>
Thomas Jefferson National Accelerator facility – Office of
Science Education. Its Elements -The element Ytterbium.
Jan31.2007.<http://education.jlab.org/itselemental/ele070.html>
By
Edith
Heather
and
Garrett