What are the characteristics of lanthanides and actinides?
All the lanthanide elements exhibit the oxidation state +3. Actinides are typical metals. All of them are soft, have a silvery color (but tarnish in air), and have relatively high density and plasticity. Some of them can be cut with a knife.
What are characteristics of lanthanides?
Lanthanides share the following common properties:
- Silvery-white metals that tarnish when exposed to air, forming their oxides.
- Relatively soft metals.
- Moving from left to right across the period (increasing atomic number), the radius of each lanthanide 3+ ion steadily decreases.
- High melting points and boiling points.
What are characteristics of actinides?
Common Properties Actinides are highly electropositive. The metals tarnish readily in air. These elements are pyrophoric (spontaneously ignite in the air), particularly as finely divided powders. Actinides are very dense metals with distinctive structures.
What are some characteristics of transition metals?
The transition metals have the following physical properties in common:
- they are good conductors of heat and electricity.
- they can be hammered or bent into shape easily.
- they have high melting points (but mercury is a liquid at room temperature)
- they are usually hard and tough.
- they have high densities.
What is the difference between lanthanide and actinide?
Hint : Lanthanoids and actinoids are elements that are placed in the lanthanide and actinide series of the periodic table….Differentiate between lanthanoids and actinoids.
| Lanthanide | Actinoids |
|---|---|
| These elements are non-radioactive except promethium. | All the elements of this series are radioactive. |
What are characteristics of metalloids?
Properties. Metalloids usually look like metals but behave largely like nonmetals. Physically, they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.
What are 2 characteristics of elements in the carbon family?
Carbon Family Properties
- Carbon family elements contain atoms that have 4 electrons in their outer energy level.
- As you move down the periodic table in the carbon family, the atomic radius and ionic radius increase while electronegativity and ionization energy decrease.
- Element density increases moving down the group.
What are two differences between lanthanides and actinides?
Hint: Lanthanides and Actinides are elements with unfilled f orbitals. Lanthanides are all metals with reactivity similar to group 2. Actinides are all radioactive elements.
What are 5 characteristics of metalloids?
Physical properties of metalloids are as follows:
- Metalloids have a solid state of matter.
- In general, metalloids have a metallic luster. Metalloids have low elasticity, they are very brittle.
- Middleweights are semi-conducted elements, and they allow leave the average transmission of heat.