Metalloids By: Nola Goss

Properties of Metalloids They are solids They are shiny and brittle They have relatively good electrical conductivity They are in groups 13, 14, 15, and 16

Boron Symbol: B Atomic #: 5 Atomic Mass: 10.811 amu Protons: 5 Electrons: 5 Neutrons:6 Valance Electrons:13 Melting Point: 2300.0 degrees C Boiling Point:2550.0 degrees C Density:2.34 g/cm3 Color: Brownish Crystal Structure: Rhombohedral

Discovered in 1808 Discovered by Pierre and Marie Curie Name origin is from Poland There are no known uses It was obtained by pitchblende, and decay of radium The reactivity of it depends on its form

Silicon Symbol: Si Atomic #:14 Atomic Mass:28.0855 amu Protons:14 Electrons:14 Neutrons:14 Valance Electrons:14 Melting Point:1410.0 degrees C Boiling Point: 2355.0 degrees C Density: 2.329 g/cm3 Color: Grey Crystal Structure: Cubic Silicon

Discovered in 1823 Discovered by Jon Berzelius Name origin is Latin Its uses are glass and semiconductors It is found in clay, granite, quartz, and sand It is the second most plentiful element If silicon is pure it is too reactive to be found in nature

Germanium Symbol: Ge Atomic #:32 Atomic Mass:72.61 amu Protons:32 Electrons:32 Neutrons:41 Valance Electrons:14 Melting Point:937.4 degrees C Boiling Point:2830.0degrees C Density:5.323 g/c3 Color: Grayish Crystal Structure: Grayish

Discovered in 1886 Discovered by Clemens Winkler Name origin is Latin It is use is semiconductors Obtained by refining of copper, zinc, and lead It is more reactive than silicon

Arsenic Symbol: As Atomic #: 33 Atomic Mass: 74.9216 Protons:33 Electrons:33 Neutrons:42 Valance Electrons:15 Melting Point:817.0 degrees C Boiling Point:613.) degrees c Density:5.72 g/cm3 Color: Gray Crystal Structure: Rhombohedral

Discovered since the time of the ancients Its unknown who discovered it Name origin is Greek It is used for poison, conducting electricity, and semiconductors Obtained from mispickel It is for the most part stable

Antimony Symbol: Sb Atomic #:51 Atomic Mass: 121.76 amu Protons:51 Electrons:51 Neutrons:71 Valance Electrons:15 Melting Point:630.0 degrees C Boiling Point:1750.0 degrees c Density:6.684g/cm3 Color: Bluish Crystal Structure: Rhomohedrial

Discovered since the ancients The discoverer is unknown Name origin is Greek It is used for hardening lead, plastics, and chemicals It is obtained from stibnite and valentinite It is reactive with most substances

Tellurium Symbol: Te Atomic #: 52 Atomic Mass: 127.6 amu Protons: 52 Electrons: 52 Neutrons:76 Valance Electrons: 16 Melting Point: 449.5 degrees C Boiling Point: 989.8 degrees C Density: 6.24g/cm3 Color: Silverish Crystal Structure: Hexagonal Tellurium

It was discovered in 1782 It was discovered Franz Muller von Reichenstien Name Origin is Greek It is used for coloring glass and ceramics, and in thermoelectric devices It is obtained from the by-product of refining lead and copper It is unreactive

Polonium Symbol: Po Atomic #:84 Atomic Mass: 209.0 amu Protons:84 Electrons:84 Neutrons:125 Valance Electrons: 16 Melting Point:254.0 degrees C Boiling Point: 962.0 degrees C Density: 9.4 g/cm3 Color: Unknown Crystal Structure: Monoclinic

It was discovered in 1898 It was discovered by Pierre and Marie Curie Name Origin is Polish It has no known uses It is obtained from pitchblende and decay of radium

References http://www.infoplease.com/encyclopedia /science/boron.html http://www.dakotamatrix.com/mineralpe dia/8430/valentinite http://periodictable.com/Elements/005/ http://www.periodictable.com/Elements/0 14/index.wt.html http://www.wikiwand.com/en/Tellurium http://www.chemicalelements.com/elemen ts/b.html https://kimrendfeld.wordpress.com/2015/ 04/03/marie-curie-a-determined-scientist/ http://periodictable.com/Elements/033/ http://www.chemicalelements.com/elemen ts/si.html http://periodictable.com/Elements/051/ http://www.chemicalelements.com/elemen ts/ge.html http://periodictable.com/Elements/052/ http://www.periodictable.com/Elements/0 84/index.html http://www.chemicalelements.com/elemen ts/as.html http://www.ptable.com/ http://www.chemicalelements.com/elemen ts/sb.html http://www.atomicheritage.org/profile/ marie-curie http://www.chemicalelements.com/elemen ts/te.html https://en.wikipedia.org/wiki/Metalloid http://yovisto.blogspot.com/2014/08/jon s-jacob-berzelius-one-of-founders- of_20.html http://www.chemicalelements.com/elemen ts/po.html https://www.webelements.com/antimony /chemistry.html http://en.silberstrasse.de/once-upon-a- time-tales-of-dark-mines-and-digging-for- treasure/historical-figures/clemens- winkler/ https://simple.wikipedia.org/wiki/Tellurium https://www.britannica.com/science/silic on http://pierres.petracorsa.fr/Min-raux- France/M/Mispickel-Plumelin-56-1 https://www.webelements.com/germaniu m/chemistry.html http://www.bulk- stone.com/2015/08/stibnite-mineral.html http://mineralseducationcoalition.org/el ements/arsenic/