Last seen: Jan 13, 2022
The lattice with the greatest packing efficiency is the hexagonal close-packed lattice with a packing efficiency of 74 %.
Given, Atoms of element B form ccp, thus no. of atoms = n No. of oct voids = n No. of td voids = 2n = 2 x n(1/3) = 2n/3 Therefore, the formula o...
Given, No. of close-packed particles = 0.2 × 6.022 × 1023 = 1.2044 × 1023 Thus, no. of octahedral voids = 1.2044 × 1023 And, no. of tetrahedral vo...
A molecule in a square close-packed layer touches four of its neighbours. Thus, its two-dimensional coordination number is 4.
(i) An atom in the body centre is not shared between unit cells, thus the atom in the body centre only belongs to the unit cell it is in. (ii) An a...
(i) End centred unit cell: They contain particles at the corners and one in the centre of any two opposite faces. Total number of particles = 2 ...
A unit cell is made up of the following parameters: (i) The three dimensions of a unit cell. (the three edges) (ii) the angles between the edges...
The importance of the lattice point is that every lattice point represents a fundamental particle of a solid which could be an ion, an atom or a molec...
Metallic solids are malleable, ductile and electrical conductors.
The ions of ionic solids are responsible for conducting electricity. In the solid state, however, these ions are not free to move around inside the so...
The above qualities are qualities of a covalent or network solid, thus it is a covalent or network solid. The solid could be a diamond (C).
Potassium sulphate → Ionic solid Benzene → Molecular (non-polar) solid Tin → Metallic solid Urea → Polar molecular solid Water → Hydrogen ...
These solids are isotropic in nature i.e., they have the same value of physical properties in all directions. Thus, they also have the same value of r...
Just like a liquid, glass also flows from top to bottom but very slowly. For this reason, glass is also considered a supercooled liquid.
Crystalline solids: Naphthalene, potassium nitrate, benzoic acid, and copper. Amorphous solids: Polyurethane, cellophane, Teflon, fibreglass and pol...
(a) Ferromagnetic: These substances (ferromagnetic substances) are strongly attracted by magnetic fields. They could be permanently magnetized even wh...
The given formula of nickel oxide is Ni0.98O1.00 Thus, the ratio of the number of Ni atoms to the number of O atoms is, Ni : O = 0.98 : 1.00 = 98 ...
Given, Atoms of Q occupy the corners of the cube. => Number of Q atoms in a unit cell = 8 x 1/8 = 1 The atom of P occupies the body centre. ...
Given, Edge length, a = 4.077 × 10–8 cm Density, d = 10.5 g cm–3 The given lattice is of fcc type, Thus the number of atoms per unit cell, z = 4...
(a) Simple cubic: In a simple cubic lattice, particles are present only at the corners and they touch each other along the edge. Let ,the edge lengt...