What is the mass of a unit cell of polonium?
Polonium (atomic mass = 209 g mol−1 crystallizes in a simple cubic unit cell and has a density of 9.196 g cm−3 .
What are the uses of polonium?
Polonium is an alpha-emitter, and is used as an alpha-particle source in the form of a thin film on a stainless steel disc. These are used in antistatic devices and for research purposes. A single gram of polonium will reach a temperature of 500°C as a result of the alpha radiation emitted.
Why do we use unit cells?
A unit cell is the most basic and least volume consuming repeating structure of any solid. It is used to visually simplify the crystalline patterns solids arrange themselves in.
How many unit cells are in polonium?
For a polonium atom in a simple cubic array, the coordination number is, therefore, six. In a simple cubic lattice, the unit cell that repeats in all directions is a cube defined by the centers of eight atoms, as shown in Figure 12.6.
Is polonium brittle or malleable?
Polonium is a metal element so it is a good thermal conductor and a good electrical conductor. Polonium is a shiny solid at standard temperature and pressure and has a high melting point. Polonium is malleable. Polonium is sonorous.
What is the packing efficiency of polonium?
Therefore the effective volume of an atom of polonium is 8R3. The next step involves calculating the packing efficiency of the simple cubic structure – in other words, the ratio of the atomic and effective volumes. We see that only 52.4% of the space is occupied by polonium atoms.
What are the uses of plutonium?
Plutonium has been used to make nuclear weapons (such as “atomic bombs”) and in nuclear power plants to produce electricity. Plutonium has also been used as a portable energy supply in space probes and other space vehicles.
How is polonium-210 used?
Polonium-210 is used in industry to make devices that remove static. This is useful for making tape, rolling paper, and spinning synthetic fibers, for example. It is also used to keep environments dust free, such as in the production of computer chips. Natural polonium is very rare.
How do you find the mass of a unit cell?
We measure up the mass of one unit cell to the mass of all the atoms present in that same cell. The number of atoms is going to depend on the type of cell it is. So we multiply the number of atoms “n” into the mass of each atom “m” to achieve the mass of a unit cell.
What is unit cell Class 12?
Unit cell can be described as the smallest portion of a crystal lattice. A unit cell is characterized by: (i) Its dimensions along the three edges, a, b and c which may or may not be mutually perpendicular. Angles between the edges, α (between b and c) β (between and c) and γ (between a and b).
What is the density of polonium?
9.4 g/cm3
polonium
| atomic number | 84 |
|---|---|
| atomic weight | 210 |
| melting point | 254 °C (489 °F) |
| boiling point | 962 °C (1,764 °F) |
| density | 9.4 g/cm3 |
What is the chemical symbol for the mass of polonium?
The chemical symbol for Polonium is Po. Atomic mass of Polonium is 209 u. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The unit of measure for mass is the atomic mass unit (amu).
How many protons electrons and electrons are in polonium?
Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. The chemical symbol for Polonium is Po. Atomic mass of Polonium is 209 u.
What is polonium used for?
A silvery-grey, radioactive semi-metal. Polonium is an alpha-emitter, and is used as an alpha-particle source in the form of a thin film on a stainless steel disc. These are used in antistatic devices and for research purposes. A single gram of polonium will reach a temperature of 500°C as a result of the alpha radiation emitted.
Density of Polonium is 9.196g/cm3. Typical densities of various substances at atmospheric pressure. Density is defined as the mass per unit volume. It is an intensive property, which is mathematically defined as mass divided by volume: