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WorksheetsTG-1 Atoms 24-25
Total questions: 10
Worksheet time: 7mins
Please, select the correct statement:
The atoms of a chemical element can have a different number of protons
The atoms of a chemical element can have a different number of neutrons
The cations of a chemical element have more electrons than protons
The elements of the periodic table are arranged according to the number of electrons
The approximate wavelengths (in nm) of the RED and VIOLET colors are, respectively:
400 and 700
700 and 400
400 and 500
500 and 400
When analyzing the results of the photoelectric effect in Lithium, Sodium and Potasium, we observe that the threshold frequency (ν0) values for these metals INCREASES in the following order:
Li > Na > K
Na > K > Li
K > Na > Li
K > Li > Na
Draw on a separate sheet the probability density of the particle in a one-dimensional box of size L for the state n = 1. The probability of finding the particle in this box when it is in its ground state is:
Greater in the interval [0, L/4] than in the interval [L/4, L/2]
Greater in the interval [L/2, 3L/4] than in [L/4, L/2]
Equal in the interval [L/2, 3L/4] and [L/4, L/2]
Less in the interval [L/2, 3L/4] than in [L/4, L/2]
Knowing that the expression for the Energy levels of an electron in a hydrogen-like atom is En = - hRZ2/n2, h = 6.626x10-34 J·s, R = 3.29x1015 s-1 and 1 eV = 1.602x10-19 J; the value of the third ionization energy of Li is:
13.6 eV
122.4 eV
54.6 eV
102.4 eV
All points located on the X-axis have the following values of θ and ϕ:
θ = 0 and ϕ = 0
θ = π/2 and ϕ = 0
θ = π/2 and ϕ = π/2
θ = 0 and ϕ = π/2
Choose the correct statement about the hydrogen-like atom:
There are 4 orbitals in the electronic level with n = 2 and 6 orbitals in that of n = 3
There are 9 degenerated orbitals in the electronic shell with n = 3
The energy of the 3s and 3p orbitals is different
For n = 3 and l = 2 , there are 4 different values of ml = -2, -1, 1, and 2
The Rydberg constant has units of:
Frecuency (Hz)
Energy (J)
Wavelength (m)
Energy/time (J/s)
The work function (ϕ) in the photoelectric effect is related to the ionization potential (IP) of an atom in the following way:
IP > ϕ
IP < ϕ
IP = ϕ
IP = 125 ϕ
In the model of a particle in a one-dimensional box of size L, identify which of the following statements is correct:
In the ground state, the wave function has a node at L/2
In the ground state, the energy remains constant even if the length of the box is reduced by half (L/2)
The kinetic energy of the particle in its ground state is greater than zero
In the second energy level (n = 2), the wave function has two nodes
