Which elements are metals? check all that apply. rhenium (re) boron (b) lithium (li) krypton (kr) phosphorus (p) mercury (hg)?
The correct answer and explanation is:
Metals from the list:
- Rhenium (Re)
- Lithium (Li)
- Mercury (Hg)
Explanation (300 words):
Elements in the periodic table are broadly classified as metals, nonmetals, or metalloids based on their physical and chemical properties. Metals are typically good conductors of heat and electricity, malleable, ductile, shiny, and tend to lose electrons during chemical reactions.
1. Rhenium (Re):
Rhenium is a transition metal found in group 7 of the periodic table. It is dense, has a high melting point, and conducts electricity well. These properties are characteristic of metals. Rhenium is used in high-temperature superalloys and electrical contacts.
2. Lithium (Li):
Lithium is an alkali metal, located in group 1 of the periodic table. It is the lightest metal and is highly reactive, especially with water. Lithium’s metallic characteristics include high electrical conductivity, luster, and the ability to form positive ions (Li⁺) easily.
3. Mercury (Hg):
Mercury is a unique metal because it is liquid at room temperature. It belongs to the transition metals and is located in group 12. Despite its liquid state, mercury exhibits metallic properties such as electrical conductivity, reflectivity, and the tendency to form positive ions.
Nonmetals and Metalloids from the list:
– Boron (B):
Boron is a metalloid, meaning it has properties between those of metals and nonmetals. It is not a good conductor and is brittle in its solid form, distinguishing it from true metals.
– Krypton (Kr):
Krypton is a noble gas and a nonmetal. It is colorless, odorless, and inert, meaning it does not readily form compounds or conduct electricity.
– Phosphorus (P):
Phosphorus is a nonmetal. It exists in several allotropes (like white and red phosphorus) and does not conduct electricity or display metallic luster.
In conclusion, among the given elements, rhenium, lithium, and mercury are metals.