Question

8
State the common characteristics of following elements -​

Answer 1

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Answer:

A series of six elements called the metalloids separate the metals from the nonmetals in the periodic table. The metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. These elements look metallic; however, they do not conduct electricity as well as metals so they are semiconductors. They are semiconductors because their electrons are more tightly bound to their nuclei than are those of metallic conductors. Their chemical behavior falls between that of metals and nonmetals. For example, the pure metalloids form covalent crystals like the nonmetals, but like the metals, they generally do not form monatomic anions. This intermediate behavior is in part due to their intermediate electronegativity values. In this section, we will briefly discuss the chemical behavior of metalloids and deal with two of these elements—boron and silicon—in more detail.

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Answer 2

Correct Question :

State the common characteristics of following elements?

Answer :

The characteristics of elements are :–

• Physical state

Metals are solid at room temperature. For example:- Gold, Silver, Aluminium and copper but mercury is a metal which is liquid at room temperature.

• Melting and boiling point

Metals have generally high melting points.

• Metallic lustre

Metals have the ability to reflect light.

• Tensile strength

Metals are hard and strong. They can hold heavy loads without breaking.

• Malleability

Gold and silver are are the two most malleable metals. The property of metals by virtue of which they can be drawn into sheets is called malleability.

• Ductility

The property of metals by virtue of which they can be drawn into wires is called ductility. Zinc is is non - ductile.

• Thermal conductivity

Metals are generally good conductors of heat. Bismuth and mercury are poor conductor of heat.

• Electrical conductivity

Metals are good conductors of electricity silver is the best conductor of electricity followed by Copper and Aluminium.

• Sonority

Metals produce a ringing sound when struck with a hard material. This property of metals is called sonority.

• Density

Most most metals have a high density. Sodium and potassium have low density.