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WorksheetsChapter 2: ATOMIC STRUCTURE (Set 1)
Total questions: 15
Worksheet time: 15mins
The best proof of quantised electron energy is obtained from:
cathode ray tube.
Bphotoelectric effect.
emission spectrum of atom.
scattering of alpha particles by a thin gold foil.
As copper is heated with Bunsen burner, a greenish blue light is radiated as a result of
the emission of energy by the electrons in a copper atom
the absorption of energy by the electrons in a copper atom.
the ionisation of copper
the transition of electron from a lower
energy level to a higher energy level
In a line spectrum of emission of hydrogen atom, how many lines can be observed if the electrons transit within n=4 and n=1?
C 5
3
4
5
6
Line corresponding to the shortest wavelength is obtained in a hydrogen spectrum when the electron drops from
n2 to n1
n3 to n1
n4 to n2
n4 to n1
Choose the transition of electrons involving the greatest energy change.
n4 to n3
n3 to n1
n4 to n2
n4 to n1
The electronic configuration with the lowest energy for 7 electrons in a 3d subshell is obtained based on
Hund’s rule
The Aufbau principle
The Pauli’s exclusion principle
The Heisenberg’s uncertainty principle
Calculate the energy required to excite an electron from n=2 to n=4.
4.09 x 10-19 J
5.45 x 10-19 J
2.05 x 106 J
2.74 x 106 J
What is the frequency, in s-1, of a radiation with energy of 3.37x10-19 J per photon?
5.08x10-54 s-1
5.08x1014 s-1
5.08x10-15 s-1
5.08x1015 s-1
What is the energy, in J, of one mole of photons emitted with a frequency of 6.336x1015 Hz?
C. 2.53x106 J
4.20x10-18 J
3.96x10-17 J
2.53x106 J
3.88x1014 J
The maximum number of electrons occupying atomic orbitals of shell M (n=3) is
8
10
18
32
Orbital with quantum numbers: n=3, l=2 and m=+2 is
2p
3s
3p
3d
The electronic configuration of copper atom is
1s2 2s2 2p6 3s2 3p6 3d10 4s1
Determine the number of electrons in the copper atom in the ground state with the azimuthal quantum number l=0.
7
8
10
12
For 18Ar, calculate the total number of electrons with the magnetic quantum number, m=0.
8
10
12
16
There are several possible ways of assigning 7 electrons to 3d-subshell. To determine the correct distribution of electrons in the ground state, we are guided by
Aufbau principle
Hund’s rule
Pauli exclusion principle
the uncertainty principle
Which of the following electronic configuration represents an element that can easily form an ion with a charge of +3?
1s2 2s2 2p6 3s2 3p1
1s2 2s2 2p6 3s2 3p3
1s2 2s2 2p6 3s2 3p6 3d1 4s2
1s2 2s2 2p6 3s2 3p6 3d3 4s2
