Question 1

The frequency of the emitted light from a cesium atom is an intensive property.

Accepted Answer

An intensive property is a physical or chemical property that is independent of the amount of substance present. In this case, the frequency of the emitted light from a cesium atom depends only on the characteristics of the atom and is not affected by the number of atoms present. Therefore, it is an intensive property.

Question 2

Each shell (principal energy level)of quantum number n contains n subshells

Accepted Answer

This is correct according to the Aufbau principle, where each shell is made up of subshells with different angular momentum quantum numbers (s, p, d, f, etc.), and the total number of subshells in a shell is equal to the shell's principal quantum number.

Question 3

According to de Broglie's equation, the wavelength associated with the motion of a particle increases as the particle mass decreases.

Accepted Answer

According to de Broglie's equation, the wavelength (λ) associated with a particle is inversely proportional to its momentum (p) and directly proportional to Planck's constant (h). As momentum is inversely proportional to mass according to the equation p = mv (where m is mass and v is velocity), it follows that the wavelength increases as mass decreases.

Question 4

The quantum numbers, n = 4, l = 1, m_l= 1, m_s= +1/2, represent an electron is a 4p subshell.

Accepted Answer

The quantum numbers n=4, l=1, and m=1 indicate that the electron is in the 4p subshell. The given values of mS and lS are consistent with these quantum numbers. Therefore, the statement is true.

Question 5

The quantum numbers, n = 3, l = 1, m_l= 0, m_s= +1/2, represent an electron in a 3s subshell.

Accepted Answer

The given quantum numbers actually represent an electron in a 3p subshell, not a 3s subshell. For a 3s subshell, l would be equal to 0, not 1.

Question 6

For all atoms of the same element, the 2s orbital is larger than the 1s orbital.

Accepted Answer

The 2s orbital has a larger principal quantum number (n=2) than the 1s orbital (n=1), and therefore has a larger size or average distance from the nucleus. This is true for all atoms of the same element, as the relative sizes of the orbitals are determined by the electron configuration and not the specific identity of the atom.

Question 7

There is nothing wrong with the following set of quantum numbers: n = 3, l = 1, m_l= 0, m_s= +1/2

Accepted Answer

The answer of There is nothing wrong with the following...

Question 8

The quantum numbers, n = 4, l = 3, m_l= 2, m_s= +1/2, represent an electron in a 4f subshell

Accepted Answer

The values of n = 4 and l = 3 correspond to the 4f subshell. The values of m_l= 2 and m_s= +1/2 represent the spin magnetic quantum numbers and are independent of the subshell. Therefore, the quantum numbers given do represent an electron in a 4f subshell.

Question 9

The scattering of helium atoms by a solid can be used to gain information about the lattice of atoms, provided the wavelength of the helium atoms is comparable to the dimensions of the lattice.What is the wavelength, in picometers, of a helium-4 atom with a kinetic energy of 0.10 eV.(mass of ⁴He = 4.0026 amu; 1 amu = 1.67 × 10^-24 g; 1 eV = 1.602 × 10^-19 J. h = 6.626 × 10^-34 J.s)

Accepted Answer

The answer of The scattering of helium atoms by a...

Question 10

What is the wavelength, in meters, of an alpha particle with a kinetic energy of 8.0 × 10^-13 J.[mass of an alpha particle = 4.00150 amu; 1 amu = 1.67 × 10^-27 kg]

Accepted Answer

The answer of What is the wavelength, in meters, of...

Question 11

What is the wavelength of a ball bearing with a mass of 10.0 g, and a velocity of 10.0 cm/s?

Accepted Answer

The answer of What is the wavelength of a ball...

Question 12

An electron in a 3p orbital could have a value of 2 for its angular momentum quantum number (l).

Accepted Answer

The answer of An electron in a 3p orbital could...

Question 13

The bonds of oxygen molecules are broken by sunlight.The minimum energy required to break the oxygen-oxygen bond is 495 kJ/mol.What is the wavelength of sunlight that can cause this bond breakage?

Accepted Answer

The answer of The bonds of oxygen molecules are broken...

Question 14

A photovoltaic cell converts light into electrical energy.Suppose a certain photovoltaic cell is only 63.5% efficient, in other words, that 63.5% of the light energy is ultimately recovered.If the energy output of this cell is used to heat water, how many 520 nm photons must be absorbed by the photovoltaic cell in order to heat 10.0 g of water from 20.0°C to 30.0°?

Accepted Answer

The answer of A photovoltaic cell converts light into electrical...

Question 15

The following set of quantum numbers is correct. n = 3, l = 3, m_l= 0, m_s= +1/2

Accepted Answer

The set of quantum numbers given is not complete. It is missing the quantum number for spin, which could be either +1/2 or -1/2. Therefore, the correct answer cannot be determined.

Question 16

A neon atom in its ground state will be diamagnetic.

Accepted Answer

Neon has a completely filled valence shell with 8 electrons, making it diamagnetic.

Quiz 7: Quantum Theory and the Electronic Structure of Atoms