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Why are silicon and germanium described as semi-metals?
Silicon and germanium are described as semi-metals because they exhibit properties of both metals and nonmetals. They can conduct electricity like metals but are not as efficient as true metals. They also have some nonmetallic characteristics such as brittle structure and lower conductivity compared to true metals.
How was germanium discovered?
In 1886 a German chemist named, Clemens A. Winkler discovered germanium. He discovered the first trace of germanium in the mineral argyrodite, while isolating it. (But germanium rarely makes distinct minerals.) He purified it to find the new element. Before this in 1871 a chemist named, Mendeleev predicted there would be a new element, that would have properties similar to the ones in silicon. His predictions were proved to be true.
How was element germanium discovered?
In 1886 a German chemist named, Clemens A. Winkler discovered germanium. He discovered the first trace of germanium in the mineral argyrodite, while isolating it. (But germanium rarely makes distinct minerals.) He purified it to find the new element. Before this in 1871 a chemist named, Mendeleev predicted there would be a new element, that would have properties similar to the ones in silicon. His predictions were proved to be true.
Is the following sentence true or false gold alloys are much harder than pure gold?
True. Gold alloys are typically harder than pure gold because they are composed of a combination of gold and other metals, which strengthens the material and increases its durability.
Which is not true of a single silicon- oxygen tetrahedron?
It has four silicon atoms.
Why are silicon and germanium described as semi-metals?
Silicon and germanium are described as semi-metals because they exhibit properties of both metals and nonmetals. They can conduct electricity like metals but are not as efficient as true metals. They also have some nonmetallic characteristics such as brittle structure and lower conductivity compared to true metals.
How was germanium discovered?
In 1886 a German chemist named, Clemens A. Winkler discovered germanium. He discovered the first trace of germanium in the mineral argyrodite, while isolating it. (But germanium rarely makes distinct minerals.) He purified it to find the new element. Before this in 1871 a chemist named, Mendeleev predicted there would be a new element, that would have properties similar to the ones in silicon. His predictions were proved to be true.
How was element germanium discovered?
In 1886 a German chemist named, Clemens A. Winkler discovered germanium. He discovered the first trace of germanium in the mineral argyrodite, while isolating it. (But germanium rarely makes distinct minerals.) He purified it to find the new element. Before this in 1871 a chemist named, Mendeleev predicted there would be a new element, that would have properties similar to the ones in silicon. His predictions were proved to be true.
In a silicon-oxygen structural unit do silicon atoms occupy corners of a tetrahedron?
true
What is a true statement about the metalloid silicon?
silicon is a better conductor of electric current than sulfur is.
What is true about silica?
Silica is silicon dioxide - SiO2.
Why aluminum-titanium alloy cannot be formed?
Not true; many titanium alloys contain aluminium.
What are the alloys of polonium?
Polonium form polonides with many metals as Na, Ca, Ba, Hg, Pb, Be, Cd, Mg, Pr, Tm etc.But polonides are compounds not true alloys.
Is the following sentence true or false gold alloys are much harder than pure gold?
True. Gold alloys are typically harder than pure gold because they are composed of a combination of gold and other metals, which strengthens the material and increases its durability.
Which is not true of a single silicon- oxygen tetrahedron?
It has four silicon atoms.
Is boron conductor?
Group 14 elements such as silicon or germanium generally act as semi-conductors. Boron, a group 13 element, normally acts as a dopant in semiconductors.
Is it true or false Metal alloys are made in order to use the best properties of each metal?
Yes, it is correct.
