CBSE - Class 11 Chemistry Structure of Atom Worksheet
1.
What is the number of photons of light with a wavelength of 4000 pm that provide 1J of energy?
2.
(ii) List the quantum numbers ($m_l$ and $l$) of electrons for 3d orbital.
3.
What is the energy in joules, required to shift the electron of the hydrogen atom from the first Bohr orbit to the fifth Bohr orbit and what is the wavelength of the light emitted when the electron returns to the ground state? The ground state electron energy is $-2.18 \times 10^{-11}$ ergs.
4.
Write the complete symbol for the atom with the given atomic number ($Z$) and atomic mass ($A$) (ii) $Z$ = 92, $A$ = 233.
5.
Calculate the wavelength for the emission transition if it starts from the orbit having radius 1.3225 nm and ends at 211.6 pm. Name the series to which this transition belongs and the region of the spectrum.
6.
In Rutherford’s experiment, generally the thin foil of heavy atoms, like gold, platinum etc. have been used to be bombarded by the $\alpha$-particles. If the thin foil of light atoms like aluminium etc. is used, what difference would be observed from the above results ?
7.
(iii) Which of the following orbitals are possible? 1p, 2s, 2p and 3f
8.
Calculate the wavenumber for the longest wavelength transition in the Balmer series of atomic hydrogen.
9.
Calculate the wavelength, frequency and wavenumber of a light wave whose period is $2.0 \times 10^{-10}$ s.
10.
Explain, giving reasons, which of the following sets of quantum numbers are not possible. (b) $n$ = 1, $l$ = 0, $m_l$ = 0, $m_s$ = – $\frac{1}{2}$
11.
Write the complete symbol for the atom with the given atomic number ($Z$) and atomic mass ($A$) (iii) $Z$ = 4, $A$ = 9.
12.
If the diameter of a carbon atom is 0.15 nm, calculate the number of carbon atoms which can be placed side by side in a straight line across length of scale of length 20 cm long.
13.
Calculate the wavelength of an electron moving with a velocity of $2.05 \times 10^7$ m s$^{-1}$.
14.
How many neutrons and protons are there in the following nuclei ? $^{13}_6$C, $^{16}_8$O, $^{24}_{12}$Mg, $^{56}_{26}$Fe, $^{88}_{38}$Sr
15.
(ii) Calculate the radius of Bohr’s fifth orbit for hydrogen atom.
16.
Using s, p, d notations, describe the orbital with the following quantum numbers. (b) $n = 3; l=1$
17.
Electronic configuration and chemical properties are dependent on one another in atom
a.
True
b.
False
18.
Calculate the energy required for the process He$^+$ (g) $\rightarrow$ He$^{2+}$ (g) + e$^-$ The ionization energy for the H atom in the ground state is $2.18 \times 10^{-18}$ J atom$^{-1}$
19.
If the photon of the wavelength 150 pm strikes an atom and one of its inner bound electrons is ejected out with a velocity of $1.5 \times 10^7$ m s$^{-1}$, calculate the energy with which it is bound to the nucleus.
20.
(b) How many electrons will be present in the subshells having $m_s$ value of –1/2 for $n$ = 4 ?
