Quantum Mechanical Model of an Atom

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Questions and Answers

What color of flame is produced by Barium Chloride?

  • Orange
  • Yellow - green (correct)
  • Red
  • Blue

What does the presence of different metal salts in fireworks primarily affect?

  • The sound produced
  • The texture of the firework
  • The color of the flame emitted (correct)
  • The height the firework reaches

Which metal salt produces a red flame?

  • Lithium Carbonate (correct)
  • Boric acid
  • Copper (II) sulfate
  • Calcium Chloride

How does sodium nitrate produce its yellow flame?

<p>By releasing sodium ions in the heat (A)</p> Signup and view all the answers

If potassium chloride were used instead of sodium nitrate, the flame color likely would be?

<p>Yellow (B)</p> Signup and view all the answers

Which color has the shortest wavelength according to the information provided?

<p>Violet (D)</p> Signup and view all the answers

What is the purpose of using a spectroscope in analyzing emitted light?

<p>To detect energy levels in an atom (A)</p> Signup and view all the answers

Which of the following elements produces a blue flame?

<p>Copper (B)</p> Signup and view all the answers

Which of the following describes the charge and location of protons in an atom?

<p>Positive charge, located in the nucleus (A)</p> Signup and view all the answers

Which subatomic particle is responsible for the negative charge of atoms?

<p>Electrons (D)</p> Signup and view all the answers

If an atom has 19 protons, how many electrons does it have assuming it is neutral?

<p>19 (A)</p> Signup and view all the answers

What is the charge of neutrons?

<p>Neutral (B)</p> Signup and view all the answers

In the context of an atom, which of the following statements is true about electrons?

<p>They have a negative charge and are located outside the nucleus. (A)</p> Signup and view all the answers

What happens to the arrangement of electrons in an atom when light is emitted, such as from fireworks?

<p>Electrons move to a higher energy level and then back down. (D)</p> Signup and view all the answers

What does the atomic number of an element represent?

<p>The total number of protons in an atom (D)</p> Signup and view all the answers

Which of the following elements has an atomic number of 19?

<p>Potassium (D)</p> Signup and view all the answers

Which quantum number indicates the main energy level of an electron?

<p>Principal Quantum Number (D)</p> Signup and view all the answers

What shape is associated with the p-orbital?

<p>Dumb-bell shape (C)</p> Signup and view all the answers

Which of the following describes the azimuthal quantum number?

<p>It describes the subshell or sublevel. (C)</p> Signup and view all the answers

What is the value of the magnetic quantum number (mℓ) for the d-sublevel?

<p>-2, -1, 0, 1, 2 (A)</p> Signup and view all the answers

Which quantum number can have a value of +½ or -½?

<p>Spin Quantum Number (C)</p> Signup and view all the answers

What orbital shape is represented by the f orbital?

<p>More complex shape with eight lobes (B)</p> Signup and view all the answers

What determines the subshell of an electron when the secondary quantum number is given?

<p>The shape of the orbital (B)</p> Signup and view all the answers

For an electron in a p orbital, what are the possible values of the magnetic quantum number?

<p>-1, 0, 1 (B)</p> Signup and view all the answers

What must be done to the paper before dropping the ballpen?

<p>Tape the paper to the floor (A)</p> Signup and view all the answers

Which individual has the contact number that begins with '0966'?

<p>Ma'am Sheryll May Rosales (A), Ma'am Tatel (D)</p> Signup and view all the answers

How many drops of the ballpen need to be completed for the experiment?

<p>50 (C)</p> Signup and view all the answers

Which column represents the average distance from the center of the circles?

<p>Column B (C)</p> Signup and view all the answers

What is the contact number of Ma'am Genelyn Almo?

<p>09473425840 (C)</p> Signup and view all the answers

Which contact number belongs to Ma'am Sheryll May Rosales?

<p>09639047223 (B)</p> Signup and view all the answers

What calculation needs to be made after counting the dots in each circle?

<p>Calculate the number of dots per square centimeter (B)</p> Signup and view all the answers

Identify the individual with a contact number that ends with '23'.

<p>Ma'am Sheryll May Rosales (A), Ma'am Genelyn Almo (B)</p> Signup and view all the answers

What should you do with each mark made by the ballpen after recording the results?

<p>Cross out each dot marked with X (B)</p> Signup and view all the answers

Which number does not belong to a Ma'am listed?

<p>09512345678 (A)</p> Signup and view all the answers

What does Column F represent in the data table?

<p>Number of dots per cm^2^ (A)</p> Signup and view all the answers

What is the area of Circle 1 based on the provided data?

<p>3.14 cm^2^ (B)</p> Signup and view all the answers

What is the purpose of plotting the average distance from the center on the x-axis?

<p>To visualize the relationship between distance and number of dots (A)</p> Signup and view all the answers

What happens to the number of dots per unit area as the distance of the dots goes farther from the center?

<p>The number of dots decreases. (A)</p> Signup and view all the answers

What is the percent probability of finding a dot in a circle with 5 dots in an area of 25.13 cm²?

<p>19.9% (D)</p> Signup and view all the answers

Which distance likely has the highest probability of finding a dot based on the graph presented?

<p>Closest to the center. (B)</p> Signup and view all the answers

How many dots are found in the area with the highest probability of finding dots according to the guidelines?

<p>5 dots (C)</p> Signup and view all the answers

Which electron configuration follows the Pauli Exclusion Principle?

<p>1s² 2s² 2p⁶ 3s¹ (A)</p> Signup and view all the answers

Which quantum number set is not allowed?

<p>n=3, l=3 (C)</p> Signup and view all the answers

What remains constant for electrons as they move farther from the nucleus?

<p>Their mass. (D)</p> Signup and view all the answers

What does the flame test suggest about the structure of an atom?

<p>Electrons emit energy as they transition between levels. (C)</p> Signup and view all the answers

Flashcards

Subatomic Particles

Tiny particles smaller than an atom, each having different charges and locations within an atom.

Proton Charge

A positively charged subatomic particle.

Neutron Charge

A neutrally charged subatomic particle.

Electron Charge

A negatively charged subatomic particle.

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Atomic Number

The number of protons in an atom.

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Atomic Mass

The mass of an atom.

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Arrangement of electrons

The specific way electrons are organized around an atom's nucleus.

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Element

A substance composed of atoms of the same type.

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Flame Emission

The process where certain elements (metals) produce specific colors of light when heated in a flame.

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Metal Salts

Compounds containing a metal and another element. They cause characteristic colors when heated.

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Element-Color Relation

Different elements produce different colors of light when heated in a flame.

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Spectroscope

An instrument that precisely analyzes the light emitted by elements. It reveals narrow spectral lines.

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Line Spectrum

A series of distinct lines found in the light emitted by an (heated) element.

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Energy Levels in Atoms

Different energy states within an atom that produce the spectral lines when excited.

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Sodium (Na)

A chemical element that produces a yellow flame color.

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Barium (Ba)

A chemical element that produces a yellow-green flame color.

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Contact Information

This table displays contact information, likely for different individuals or organizations.

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Phone Number

A sequence of digits used to reach a specific person or organization by phone.

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Prefix

The first few digits of a phone number, often indicating a specific region or area code.

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Mobile Phone

A wireless phone that can be used to make calls and send text messages from different locations.

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Landline Phone

A traditional wired phone connected to a fixed location, often used in homes or offices.

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s-orbital shape

The s-orbital has a spherical shape.

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p-orbital shape

The p-orbital has a dumbbell shape (bilobate).

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d-orbital shape

The d-orbital has a clover or quadrilobate shape.

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f-orbital shape

The f-orbital has a more complex shape, like a d-orbital but split.

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Principal Quantum Number (n)

Describes the main energy level of an orbital (n=1 to 7).

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Azimuthal Quantum Number (ℓ)

Describes the subshell (s, p, d, f).

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Magnetic Quantum Number (mℓ)

Describes the orbital within a subshell.

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Spin Quantum Number (ms)

Describes the electron spin (+1/2 or -1/2).

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Atomic model simulation

A method to visually represent the probability of finding electrons at different distances from the nucleus using a random drop experiment.

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Average distance from center

The midpoint between the inner and outer edges of a circle, measuring the distance of each circle from the center.

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Area of circle

The space enclosed within a circle, calculated using the formula πr² where 'r' is the radius.

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Difference of areas

The difference between the areas of two consecutive circles, representing the increase in space between each circle.

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Number of dots in a circle

The total count of marked dots that land within a specific circle in the simulation.

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Number of dots per cm²

The density of dots within a circle, calculated by dividing the number of dots in a circle by its area.

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Probability of finding dots

The likelihood of finding a dot within a specific area of the simulation, expressed as a percentage.

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What does the simulation demonstrate about electron distribution?

The simulation models the probabilistic nature of electron location, showing that electrons are more likely to be found closer to the nucleus and less likely farther away.

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Distance with highest dot probability

The distance from the center of the circle where the density of dots is greatest, indicating the highest probability of finding a dot.

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Electron distribution

The arrangement of electrons around an atom's nucleus, influenced by quantized energy levels and orbital shapes.

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Angular Momentum Quantum Number (l)

Describes the shape of an electron's orbital, ranging from 0 (spherical) to n-1 (more complex shapes).

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Allowed Quantum Number Sets

Specific combinations of quantum numbers that are physically possible for an electron in an atom, following the rules of atomic structure.

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Pauli Exclusion Principle

A principle stating that no two electrons in an atom can have the same set of all four quantum numbers. Each orbital can hold a maximum of two electrons with opposite spins.

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Orbital filling diagram

A visual representation of how electrons fill orbitals in an atom, following the Aufbau principle and Hund's rule.

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Study Notes

Quantum Mechanical Model of an Atom

  • The Rutherford model of the atom, while picturing the atom as mostly empty space with mass concentrated in the nucleus, could not explain the colors of light emitted by heated metals.
  • The Quantum Mechanical Model describes the energies and positions of electrons more accurately than the Rutherford model.
  • Students are expected to explain how the Quantum Mechanical Model describes the energies and positions of electrons.
  • The characteristics of matter are related to how electrons are distributed inside atoms.

Get Refreshed (Elicit)

  • The three subatomic particles are protons, neutrons, and electrons.
  • Protons have a positive charge, and are located inside the nucleus.
  • Neutrons have no charge, and are located inside the nucleus
  • Electrons have a negative charge, and are located outside the nucleus.

Get Acquainted (Engage)

  • Fireworks use metal salts to produce colors.
  • Different metals produce different colors of light when heated.
  • The colors emitted by metal salts are due to the arrangement of electrons in their atoms.

Get Informed (Explain)

  • Atomic spectra are unique to each element.
  • The Bohr model of the atom, while refined Rutherford's model, suggested that electrons orbit the nucleus in specific, fixed energy levels.
  • Electrons emit light when they transition between energy levels.
  • The Quantum Mechanical Model treats electrons as waves rather than as particles in precise orbits.
  • Electrons exist in orbitals, regions of space where the probability of finding an electron is highest.
  • Atomic orbitals are organized into energy levels and sublevels.

Quantum numbers

  • Quantum numbers describe the properties of electrons in an atom.

  • The principal (n) quantum number describes the energy level.

  • The angular momentum (l) quantum number defines the shape of the orbital.

  • The magnetic (ml) quantum number describes the orientation of the orbital in space.

  • The spin (ms) quantum number describes the direction of electron spin.

  • Electrons are described in terms of orbitals.

  • The quantum mechanical model introduces the concept of orbitals; regions within an atom where there is a high probability of finding an electron.

  • Atomic orbitals are assigned labels (spdf).

  • Different shapes and orientations of orbitals are associated with different sublevels of energy

  • Energy levels can hold a maximum number of electrons.

  • Sublevels are organized into principal energy levels. Levels and sublevels are further organized into orbitals.

  • A given orbital can hold a maximum of 2 electrons.

  • The Pauli exclusion principle dictates that no two electrons in the same atom can have the same set of four quantum numbers (n, l, ml, ms).

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