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Periodic Table Honors Chemistry

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Periodic Table Honors Chemistry - Page Text Content

FC: Metalloids | Rachel Williams | Jen Thurau

1: Boron Silicon Germanium Arsenic Tellurium Antimony Polonium | The boiling points, melting points, and densities of the metalloids vary widely. The intermediate conductivity of metalloids means they tend to make good semiconductors. | Electronegativities between those of metals and nonmetals. Ionization energies between those of metals and nonmetals. Possess some characteristics of metals/some of nonmetals. Reactivity depends on properties of other elements in reaction. Often make good semiconductors.

2: Boron: -black -hard -not toxic -HIGH melting point -used to "dope" down silicon and germanium to lessen thier electrical properties -EX: used in cleaning products such as bleach and detergents. -boron carbide is used in tank amor and bullet proof vests. | Silicon: -silvery -hard -not toxic -brittle - expands when it freezes - silicon dioxide has been described as the most common oxide of silicon in the universe - EX: Silicon chips are the basis of modern electronics and computing

3: Antimony: -silvery white -expands when it freezes - Antimony's electrical and thermal conductivity are lower than most metals' conductivities - EX: batteries -SbCl3:is a contributor in detecting Vitamin A, and can also play as a catalyst. | Germanium: -semi conductor -has lust, brittle, hard, silvery -expands when it freezes - Benefitial: it is toxic to bacteria, but not mammals -EX: Can be used in alloys, which is a homogenous mixture of metals. intagrated circuts which are small electronic devices, made out of semiconductor material. -Compounds:germanium dioxide contributes into making optical material used in wide-eyed lens.

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