Subject Experts Solutions for Chapter: Atomic Structure, Exercise 2: PRACTICE QUESTIONS (COMPETITION WING)

Different gases can produced colours in discharge tube. Explain with reason.

Anode rays produced by isotopes and isobars possess the same charge when taken in different discharge tubes. Which among the two sets of anode rays show different deflections in the presence of an electric field?

If  ${}_{\mathrm{x}}{}^{\mathrm{y}}\mathrm{A}^{+1} \mathrm{or} {}_{\mathrm{x}-1}{}^{\mathrm{y}-2}\mathrm{B}^{+1}$ were used instead of a $\mathrm{\alpha }-$particles in Rutherford's experiment, which would be better and why?

According to Bohr's theory, the electrons revolve round the nucleus in definite paths called orbits. Do the electrons revolve round with same speed in all orbits? Justify.

A natural sample of an element contains two isotopes A and B. The difference in their atomic mass is $2$ units. If the percentage abundance of the lighter isotope A is $25\%$ and its atomic mass is y, calculate the average atomic weight.

M-shells of two elements A and B have $18$ electrons. The difference in the number of electrons present in N-shell of A and B is $8$. The M-shell is the penultimate shell in B. Predict the range of probable atomic numbers of A and B.

Which postulate of Rutherford's theory is not derived from the results of $\mathrm{\alpha }-$ray scattering experiment? On what basis Rutherford's could assume that?

Predict the possible atomic number(s) of an atom in which the third shell is incompletely filled and maximum $4$ more electrons can be added to that shell of the atom.