Which one of the following is not a borderline element?
Bismuth
Understanding Borderline Elements (Metalloids)
Borderline elements are also known as metalloids. These elements exhibit properties that are intermediate between those of metals and nonmetals. They are typically found along the dividing line in the periodic table between the metallic and nonmetallic elements. Common metalloids include Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te), and sometimes Polonium (Po) and Astatine (At) are considered.
Analyzing the Given Options for Borderline Elements
Let's examine each option to determine if it is a borderline element or not:
- Boron (B): Boron is located in Group 13. It is widely recognized and classified as a metalloid. Its properties are intermediate between metals and nonmetals.
- Silicon (Si): Silicon is located in Group 14. It is another classic example of a metalloid, known for its semiconductor properties, which are characteristic of metalloids.
- Polonium (Po): Polonium is located in Group 16. Its classification can be somewhat debated; it is sometimes considered a metalloid but is often classified as a metal (specifically, a post-transition metal or poor metal) due to its increasingly metallic character down the group. However, it is occasionally included in lists of metalloids or elements with borderline properties.
- Bismuth (Bi): Bismuth is located in Group 15. Bismuth is a heavy element and is consistently classified as a metal, specifically a post-transition metal or poor metal. It exhibits metallic properties and is not considered a metalloid or a borderline element.
Identifying the Element That Is Not a Borderline Element
Based on the typical classification of elements along the periodic table's metal-nonmetal boundary, Boron and Silicon are clearly metalloids. Polonium is sometimes borderline, but Bismuth is clearly on the metal side of the classification line and is considered a metal, not a metalloid.
Therefore, Bismuth is the element among the given options that is not a borderline element.
| Element | Symbol | Typical Classification | Is it a Borderline Element (Metalloid)? |
|---|---|---|---|
| Boron | B | Metalloid | Yes |
| Silicon | Si | Metalloid | Yes |
| Polonium | Po | Metal (often Post-Transition Metal) / Sometimes considered Metalloid | Often No, but sometimes Yes (borderline) |
| Bismuth | Bi | Metal (Post-Transition Metal) | No |
Revision Table: Key Element Classifications
Understanding the main categories of elements helps in identifying borderline elements.
| Classification | General Properties | Examples |
|---|---|---|
| Metals | Good conductors of heat and electricity, malleable, ductile, lustrous (shiny), typically solid at room temperature (except Mercury). Form positive ions. | Iron (Fe), Copper (Cu), Gold (Au), Aluminum (Al), Sodium (Na), Bismuth (Bi) |
| Nonmetals | Poor conductors of heat and electricity (insulators), brittle (if solid), dull appearance. Tend to form negative ions. | Oxygen (O), Nitrogen (N), Carbon (C), Sulfur (S), Chlorine (Cl) |
| Metalloids (Borderline Elements) | Exhibit properties between those of metals and nonmetals. Often semiconductors. Appearance can be shiny or dull. | Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te) |
Additional Information on Element Properties
The distinction between metals, nonmetals, and metalloids is not always sharp, especially for elements near the boundary. Properties change gradually across the periodic table.
- Metallic character generally increases down a group and decreases across a period from left to right.
- Nonmetallic character generally decreases down a group and increases across a period from left to right.
- Metalloids are found in the region where these trends meet, displaying mixed characteristics.
- Bismuth's position in Period 6 and Group 15 places it firmly in the region of the periodic table where elements are considered metals, despite being relatively brittle compared to other metals.
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