Your Response. Which element is reduced? The element that reduced is K, but its. A new element has been discovered and you are on the task force to determine where this new element will be placed on the periodic table with its known properties. Using the model of the periodic table and its periodic patterns,. You find a compound composed only of element x and hydrogen,and know that it is Each molecule has 2. What is element x? An element is highly conductive, highly reactive, soft, and lustrous.
The element most likely belongs to which group? List two uses for each of these metalloids. Why is silicon used extensively in electronics? What are borosilicates used for? Why is the use of arsenic as an insecticide decreasing? What is a main application of antimony? Show References References Laura Guerin. Multiple Choice. CK Foundation — Christopher Auyeung.
Periodic Table. Aram Dulyan Wikimedia: Aramgutang. Licenses and Attributions. Compounds composed entirely of nonmetals are covalent substances. They generally form acidic or neutral oxides with oxygen that that dissolve in water to form acids:.
As you may know, carbonated water is slightly acidic carbonic acid. Metalloids have properties intermediate between the metals and nonmetals. Metalloids are useful in the semiconductor industry. Metalloids are all solid at room temperature. They can form alloys with other metals. Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors.
Silicon for example appears lustrous, but is not malleable nor ductile it is brittle - a characteristic of some nonmetals.
It is a much poorer conductor of heat and electricity than the metals. The physical properties of metalloids tend to be metallic, but their chemical properties tend to be non-metallic. Metallic character is strongest for the elements in the leftmost part of the periodic table, and tends to decrease as we move to the right in any period nonmetallic character increases with increasing electronegativity and ionization energy values.
Within any group of elements columns , the metallic character increases from top to bottom the electronegativity and ionization energy values generally decrease as we move down a group.
This general trend is not necessarily observed with the transition metals. Mike Blaber Florida State University. Binod Shrestha University of Lorraine. Learning Objectives To understand the basic properties separating Metals from Nonmetals and Metalloids. Metals With the exception of hydrogen, all elements that form positive ions by losing electrons during chemical reactions are called metals.
Physical Properties of Metals Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Other properties include: State : Metals are solids at room temperature with the exception of mercury, which is liquid at room temperature Gallium is liquid on hot days. Iridium and osmium have the highest densities where as lithium has the lowest density. Melting and Boiling Points : Metals have high melting and boiling point.
Tungsten has the highest melting point where as silver has low boiling point. Sodium and potassium have low melting points. Chemical Properties of Metals Metals are electropositive elements that generally form basic or amphoteric oxides with oxygen.
Other chemical properties include: Electropositive Character : Metals tend to have low ionization energies, and typically lose electrons i. Example Would you expect it to be solid, liquid or gas at room temp? Solutions Oxides of metals are characteristically solid at room temp.
Nonmetals Elements that tend to gain electrons to form anions during chemical reactions are called non-metals.
Physical Properties of nonmetals: Physical State : Most of the non-metals exist in two of the three states of matter at room temperature: gases oxygen and solids carbon. Non-Malleable and Ductile : Non-metals are very brittle, and cannot be rolled into wires or pounded into sheets. Conduction : They are poor conductors of heat and electricity. Luster: These have no metallic luster and do not reflect light Conductivity : Poor conductors of heat and electricity Melting and Boiling Points : The melting points of non-metals are generally lower than metals Seven non-metals exist under standard conditions as diatomic molecules : H 2 g N 2 g O 2 g F 2 g Cl 2 g Br 2 l I 2 l volatile liquid - evaporates readily.
Chemical Properties of Nonmetals Non-metals have a tendency to gain or share electrons with other atoms. They are electronegative in character. Metalloids Properties intermediate between the metals and nonmetals. Conduction : Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semi-conductors.
0コメント