Question 1

Which of the following elements is the smallest size chalcogen?

Accepted Answer

Chalcogens are elements in group 16 of the periodic table, which includes oxygen, sulfur, selenium, tellurium, and polonium. Of these elements, oxygen has the smallest size, with a smaller atomic radius than sulfur, selenium, or tellurium. Therefore, choice C (O) is the best answer as the smallest size chalcogen.

Question 2

Which s orbital is the largest?

Accepted Answer

The answer of Which s orbital is the largest?
...

Question 3

Calculate the energy in joules of microwave radiation of wavelength 12.7 centimeters. (E = hν, h = 6.63 × 10^-34 J sec; speed of light = wavelength × ν, speed of light = 3 × 10⁸ meters/sec.)

Accepted Answer

The answer of Calculate the energy in joules of microwave...

Question 4

The only possible way for an excited state electron to return to the ground state is to emit energy in the form of visible light.

Accepted Answer

An excited state electron can return to the ground state by emitting energy in various forms, not just visible light, including infrared radiation, ultraviolet radiation, or even transferring energy to another electron or process within the atom or molecule (non-radiative processes).

Question 5

The units of h (Planck's constant)are ________.

Accepted Answer

Planck's constant is expressed as Joules times seconds (J.s) as it relates energy to frequency of electromagnetic radiation.

Question 6

The p-block represents a region on the periodic table which is 6 elements in width.

Accepted Answer

The p-block on the periodic table contains elements in groups 13-18, which is a total of 6 groups or 30 elements.

Question 7

Predict the formula of the compound produced in a reaction between barium (Ba)and oxygen (O).

Accepted Answer

In this reaction, barium (Ba) reacts with oxygen (O) to form barium oxide (BaO). The formula for barium oxide is simply BaO, which is given in choice B.

Question 8

What is the wavelength (in meters)of radio waves that have a frequency of 89.9 MHz? (wavelength × frequency = speed of light; speed of light = 3 × 10⁸ meters/sec.)

Accepted Answer

The wavelength is calculated using the formula: wavelength = speed of light / frequency. Substituting the given values, wavelength = (3 × 10^8 m/s) / (89.9 × 10^6 Hz) = 3.34 meters.

Question 9

The s-type orbitals of any given principal energy level are always spherical in shape.

Accepted Answer

The s-orbitals of any principal energy level have a spherical shape because they have only one radial node and no angular nodes. This means the electron cloud density is distributed uniformly around the nucleus, making it spherical in shape.

Question 10

The f-block represents a region on the periodic table which is 10 elements in width.

Accepted Answer

The f-block represents a region on the periodic table which is 14 elements in width, corresponding to the filling of the 4f and 5f orbitals.

Question 11

Metals generally become more reactive as one proceeds down a column (group).

Accepted Answer

This is because as one goes down a column, the atomic radius increases and there are more electron shells. This makes it easier for the metal atoms to lose electrons and form positive ions, increasing their reactivity. Additionally, the shielding effect of the inner electrons decreases, making it easier for the outer electrons to be involved in chemical reactions.

Question 12

Atoms tend to increase in size as one moves from left to right across a period.

Accepted Answer

Atoms tend to decrease in size as one moves from left to right across a period due to an increase in the effective nuclear charge which attracts the electrons more strongly towards the nucleus.

Question 13

Which of the following elements is the largest size halogen?

Accepted Answer

The halogens are a group of non-metallic elements in the periodic table, which includes fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). As one moves down the halogen group in the periodic table, the atomic size, or radius, tends to increase due to the addition of more energy levels. Bromine (Br) is the largest halogen because it is located at the bottom of the group and has the most energy levels.

Question 14

What is the trend in atomic size in the series of Group IIA elements Be through Ra?

Accepted Answer

The trend in atomic size in the series of Group IIA elements Be through Ra is that it increases in this series. This is due to the increase in the number of electron shells as you go down the group. As the atomic number increases, the number of electron shells in the atom also increases, which leads to an increase in the atomic size.

Question 15

In a single atom, what is the maximum number of electrons that can have quantum number n=4?

Accepted Answer

The answer of In a single atom, what is the...

Question 16

Bohr's atomic theory places an atom's electrons in discrete-energy circular paths around a central, positively charged nucleus.

Accepted Answer

This is a basic tenet of Bohr's atomic theory - that electrons orbit around the nucleus in specific energy levels rather than in a continuous way, which had been previously believed.

Question 17

Phosphorus atoms have five valence electrons.

Accepted Answer

Phosphorus belongs to group 15 or 5A in the periodic table, which means it has 5 valence electrons in its outermost shell.

Question 18

Predict the formula of the compound produced in a reaction between lithium (Li)and phosphorus (P).

Accepted Answer

Lithium (Li) has a +1 charge and phosphorus (P) has a -3 charge. To balance the charges, three lithium ions are needed for each phosphorus ion, resulting in the formula Li₃P.

Question 19

The observed line spectra of electrically excited gas samples tend to support the notion that electron energies are quantized.

Accepted Answer

The line spectra observed in electrically excited gas samples show discrete lines rather than a continuous spectrum, supporting the idea that electrons can only occupy certain quantized energy levels.

Question 20

The n = 5 principal energy level can hold a maximum of 25 electrons.

Accepted Answer

The maximum number of electrons that can be held in the n = 5 principal energy level is determined by the formula 2n^2, which gives 2(5)^2 = 50 electrons, not 25.

Quiz 4: The Modern Model of the Atom

Which of the following elements is the smallest size chalcogen?

Which s orbital is the largest?

Calculate the energy in joules of microwave radiation of wavelength 12.7 centimeters. (E = hν, h = 6.63 × 10^-34 J sec; speed of light = wavelength × ν, speed of light = 3 × 10⁸ meters/sec.)

The only possible way for an excited state electron to return to the ground state is to emit energy in the form of visible light.

The units of h (Planck's constant) are ________.

The p-block represents a region on the periodic table which is 6 elements in width.

Predict the formula of the compound produced in a reaction between barium (Ba) and oxygen (O) .

What is the wavelength (in meters) of radio waves that have a frequency of 89.9 MHz? (wavelength × frequency = speed of light; speed of light = 3 × 10⁸ meters/sec.)

The s-type orbitals of any given principal energy level are always spherical in shape.

The f-block represents a region on the periodic table which is 10 elements in width.

Metals generally become more reactive as one proceeds down a column (group).

Atoms tend to increase in size as one moves from left to right across a period.

Which of the following elements is the largest size halogen?

What is the trend in atomic size in the series of Group IIA elements Be through Ra?

In a single atom, what is the maximum number of electrons that can have quantum number n=4?

Bohr's atomic theory places an atom's electrons in discrete-energy circular paths around a central, positively charged nucleus.

Phosphorus atoms have five valence electrons.

Predict the formula of the compound produced in a reaction between lithium (Li) and phosphorus (P) .

The observed line spectra of electrically excited gas samples tend to support the notion that electron energies are quantized.

The n = 5 principal energy level can hold a maximum of 25 electrons.

Quiz 4: The Modern Model of the Atom

Which of the following elements is the smallest size chalcogen?

Which s orbital is the largest?

Calculate the energy in joules of microwave radiation of wavelength 12.7 centimeters. (E = hν, h = 6.63 × 10-34 J sec; speed of light = wavelength × ν, speed of light = 3 × 108 meters/sec.)

The only possible way for an excited state electron to return to the ground state is to emit energy in the form of visible light.

The units of h (Planck's constant) are ________.

The p-block represents a region on the periodic table which is 6 elements in width.

Predict the formula of the compound produced in a reaction between barium (Ba) and oxygen (O) .

What is the wavelength (in meters) of radio waves that have a frequency of 89.9 MHz? (wavelength × frequency = speed of light; speed of light = 3 × 108 meters/sec.)

The s-type orbitals of any given principal energy level are always spherical in shape.

The f-block represents a region on the periodic table which is 10 elements in width.

Metals generally become more reactive as one proceeds down a column (group).

Atoms tend to increase in size as one moves from left to right across a period.

Which of the following elements is the largest size halogen?

What is the trend in atomic size in the series of Group IIA elements Be through Ra?

In a single atom, what is the maximum number of electrons that can have quantum number n=4?

Bohr's atomic theory places an atom's electrons in discrete-energy circular paths around a central, positively charged nucleus.

Phosphorus atoms have five valence electrons.

Predict the formula of the compound produced in a reaction between lithium (Li) and phosphorus (P) .

The observed line spectra of electrically excited gas samples tend to support the notion that electron energies are quantized.

The n = 5 principal energy level can hold a maximum of 25 electrons.

Calculate the energy in joules of microwave radiation of wavelength 12.7 centimeters. (E = hν, h = 6.63 × 10^-34 J sec; speed of light = wavelength × ν, speed of light = 3 × 10⁸ meters/sec.)

What is the wavelength (in meters) of radio waves that have a frequency of 89.9 MHz? (wavelength × frequency = speed of light; speed of light = 3 × 10⁸ meters/sec.)