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All the forms of matter except gases emit electromagnetic radiation continuously. The gases which electrically or thermally excited emit a certain wavelength only, then which of the following is/are true about the process (i) The spacing between the atoms in the other forms of matter is high than in gas (ii) The spacing between the atoms in gases is high than the other forms of matter (iii) The energy of the emitted radiation depends on the spacing between the atoms (iv) The wavelength of the emitted radiation depends on the spacing between the atoms 
A collection of N atoms is exposed to a strong resonant electromagnetic radiation with Ng atoms in the ground state and N atoms in the excited state, such that Ng + Ne = N. This collection of two-level atoms will have the following population distribution
A compound is made up of three elements X, Y and Z. X atoms are present at each corner of the unit cell, Y atoms are present on each edge and Z atoms are present in the centre of each face. The formula of the compound is:
Consider the following postulates of the atomic theory by John Dalton. Identify the correct ones. Atoms of various elements exhibit different natures. They do not have similar features. By combining in a ratio of the whole number, atoms form the compounds. Atoms are never destroyed nor created during any chemical reaction. 
Which of the following statements regarding an atom are correct? 1) If two atoms with similar ionization potential form a bond, then this bond will most probably be either covalent or metallic. 2) When atoms with different ionization potentials form a bond, the bond will be mainly ionic. 3) If the atom or molecule already has its outer shells completely full, then the bonding between the atoms or molecules will be a secondary bond when it solidifies.
Which of the following features of atoms determine the degree to which the solute atoms dissolve in the solvent atoms? 1. Atomic size factor 2. Crystal structure 3. Electronegativity
Consider the following statements: A characteristic of the structure of metallic atoms is that 1. their outermost orbital of electrons is nearly complete and they attract electrons from other atoms 2. their atoms are smaller and more compact than those of non-metallic elements Which of the above statements is/are correct?
The ability of an atom or a group of atoms to combine with other atoms or group of atoms is represented by a whole number known as:
Assuming that A and B mix to form a substitutional solid solution and that all configurations of A and B atoms are equally probable, the number of distinguishable ways of arranging the atoms on the atom sites, if N1=8 and N2=4 is_____ (N1, N2 are the number of atoms in A and B respectively).
A cubic cell consists of two atoms of masses m, and m2(m1 > m2) with m1 and m2 atoms situated on alternate planes. Assuming only nearest neighbour interactions, the centre of mass of the two atoms