CBSE - Class 11 Chemistry Structure of Atom Worksheet
EXERCISES
1.
(i) An atomic orbital has $n$ = 3. What are the possible values of $l$ and $m_l$ ?
2.
(ii) What are the atomic numbers of elements whose outermost electrons are represented by (a) $3s^1$
3.
Using s, p, d notations, describe the orbital with the following quantum numbers. (d) $n=4; l=3$.
4.
Write the complete symbol for the atom with the given atomic number ($Z$) and atomic mass ($A$) (i) $Z$ = 17, $A$ = 35.
5.
How many electrons in an atom may have the following quantum numbers? (b) $n$ = 3, $l$ = 0
6.
An atom of an element contains 29 electrons and 35 neutrons. Deduce (ii) the electronic configuration of the element.
7.
Similar to electron diffraction, neutron diffraction microscope is also used for the determination of the structure of molecules. If the wavelength used here is 800 pm, calculate the characteristic velocity associated with the neutron.
8.
Indicate the number of unpaired electrons in : (b) Si,
9.
Symbols $^{79}_{35}$Br and $^{79}$Br can be written, whereas symbols $^{35}_{79}$Br and $^{35}$Br are not acceptable. Answer briefly.
10.
An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.
11.
How many electrons in an atom may have the following quantum numbers? (a) $n$ = 4, $m_s$ = – $\frac{1}{2}$
12.
(ii) What are the atomic numbers of elements whose outermost electrons are represented by (b) $2p^3$
13.
(ii) Calculate the radius of Bohr’s fifth orbit for hydrogen atom.
14.
Write the complete symbol for the atom with the given atomic number ($Z$) and atomic mass ($A$) (iii) $Z$ = 4, $A$ = 9.
15.
An atom of an element contains 29 electrons and 35 neutrons. Deduce (i) the number of protons
16.
Among the following pairs of orbitals which orbital will experience the larger effective nuclear charge? (i) 2s and 3s,
17.
Explain, giving reasons, which of the following sets of quantum numbers are not possible. (a) $n$ = 0, $l$ = 0, $m_l$ = 0, $m_s$ = + $\frac{1}{2}$
18.
Explain, giving reasons, which of the following sets of quantum numbers are not possible. (f) $n$ = 3, $l$ = 1, $m_l$ = 0, $m_s$ = + $\frac{1}{2}$
19.
An electron is in one of the 3d orbitals. Give the possible values of $n$, $l$ and $m_l$ for this electron.
20.
Indicate the number of unpaired electrons in : (d) Fe and
