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WorksheetsAtomic Structure
Total questions: 25
Worksheet time: 36mins
For Lyman series, the first line is the
highest energy
highest frequency
longest wavelength
none of the above
Which of the following are the postulate of Bohr's atomic model?
Electron moves in circular orbits around the nucleus
The energy of an electron in a hydrogen atom is quantised
If energy is supplied, electron absorbs the energy and is promoted from a lower energy level to a higher energy level
At excited state, the electron is unstable. It will fall back to lower energy level and releases a specific amount of energy (photon) in the form of light
A certain photon of light has a wavelength of 4.22x10-7 m. What is the frequency? (v=c/λ)
7.11x1014 Hz
7.11Hz
1.41x10-15
-1.41x1015
Calculate the energy of electron at n=6
6.055 x 10^-20 J
5.655 x10^-20 J
-6.055 x10^-20 J
1.320 x10^-20 J
Which of the following line is correct when electron undergoes transition from excited state n= 7 to ground state n= 1 in Lyman Series
5th line
4th line
6th line
7th line
Which of the following Hydrogen atom series of spectrum is NOT in infrared region in electromagnetic region
Balmer
Brackett
Pfund
Lyman
Paschen
When an electron moves from n=4 to n=1, what wavelength of energy is emitted?
97 nm
410 nm
434 nm
1282 nm
What is the maximum number of electrons that can be represented by n = 3?
2
6
10
18
What is meant by orbital?
a 2-d region around nucleus whereby the probability of finding electron is highest
a 3-d region around orbit whereby the probability of finding electron is highest
a 2-d region around nucleus whereby the probability of finding electron is lowest
a 3-d region around nucleus whereby the probability of finding electron is highest
The quantum number that determines the orientation of the orbitals?
azimuthal quantum number (l)
magnitude quantum number (m)
electron spin quantum number (s)
principle quantum number (n)
Write a set of quantum numbers for a 4d orbital.
{4,2,-3,-1/2}
{4,1,1,+1/2}
{4,2,-2,+1/2}
{4,0,1,-1/2}
Which orbitals CANNOT exist?
2p
7s
3f
4d
Which set of quantum numbers is not allowed?
{3,1,1,-1/2}
{4,2,-1,-1/2}
{2,1,1,+1/2}
{2,1,-2,+1/2}
The chromium atom (atomic number 24) in its ground state has the electronic configuration:
1s2 2s2 2p6 3s2 3p6 3d3 4s1 3d5
1s2 2s2 2p6 3s2 3p6 3d3 4s2 3d4
1s2 2s2 2p6 3s2 3p6 3d2 4s2 4p2
1s2 2s2 2p6 3s2 3p6 3d2 4s2 4p2
Cu (Z=29) shows anomalous electronic configuration.
The actual electronic configuration is
1s2 2s2 2p6 3s2 3p6 4s1 3d10.
This is because ...
the half-filled d-orbital (3d5) is more stable
the completely filled d-orbital (3d10) is more stable
the partially filled d-orbital (3d4) is more stable
According to Aufbau Principle, electrons are filled into 4s orbital before 3d orbital.
When removing the electrons, the electron needs to be removed from which sub-shell first?
4s
3d
3p
1s
How many unpaired electrons are there in the Vanadium ion, V3+ (Z: 23)
2
4
3
6
All ions matches with this electronic configuration.Except?
1s22s22p63s23p6
13Al3+
17Cl-
16S2-
20Ca2+
Which of the following element has this orbital in its electronic configuration.
Ar (Z=18)
K (Z=19)
Ca (Z=20)
Sc (Z=21)
