The density of a unit cell lattice is calculated using the following formula:
...... (1)
Here,
is density, m is molar mass or atomic weight, n is number of atoms per unit cell, a is edge length and
is Avogadro's number.
For a body centered cubic lattice, number of atoms per unit cell is 2 and relation between edge length a and radius of atom r is as follows:
...... (2)
Here, r is atomic radius and a is edge length.
Calculate edge length by rearranging equation (1) as follows:
![a=\sqrt[3]{\frac{mn}{\rho N_{A}}}](https://tex.z-dn.net/?f=a%3D%5Csqrt%5B3%5D%7B%5Cfrac%7Bmn%7D%7B%5Crho%20N_%7BA%7D%7D%7D)
Density of metal is
and molar mass is 50.99 g/mol, putting the values,
![a=\sqrt[3]{\frac{(50.99 g/mol)(2)}{(7.25 g/cm^{3})(6.023\times 10^{23} mol^{-1})}}=2.86\times 10^{-23} cm](https://tex.z-dn.net/?f=a%3D%5Csqrt%5B3%5D%7B%5Cfrac%7B%2850.99%20g%2Fmol%29%282%29%7D%7B%287.25%20g%2Fcm%5E%7B3%7D%29%286.023%5Ctimes%2010%5E%7B23%7D%20mol%5E%7B-1%7D%29%7D%7D%3D2.86%5Ctimes%2010%5E%7B-23%7D%20cm)
Therefore, edge length is
, putting the value in equation (2) to calculate atomic radius.

Therefore, atomic radius will be
.
The awnser would be (C.) As it is the only correct one.
Answer: D, Thermal energy
Explanation: particles in a substance will move for one reason. That reason is heat. The hotter the substance the more the particles will move.
Explanation:
cellular respiration is a process that occurs in the mitochondria of all organisms. In this process, both plants and animals break down simple sugars into carbon dioxide and water and release energy in the form of adenosine triphosphate (ATP)
Answer:
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus. All these three subatomic particles construct an atom.
The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.
Symbol= e-
Mass= 9.10938356×10-31 Kg
It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.
While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.
Symbol of proton= P+
Symbol of neutron= n0
Mass of proton=1.672623×10-27 Kg
Mass of neutron=1.674929×10-27 Kg
A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.