Kahoot: Bohr and Quantum Mechanical Model

Which of the following best describes Bohr's model of the atom?

• Electrons orbit the nucleus in fixed paths.

• Electrons are found in probability clouds around the nucleus.

• Electrons are embedded in a positively charged sphere.

• Electrons move randomly around the nucleus.

Answer explanation

Bohr's model posits that electrons orbit the nucleus in fixed paths, similar to planets around the sun. This contrasts with later models that describe electron behavior in terms of probability clouds or random motion.

What is the principal quantum number (n) primarily associated with?

• The shape of the orbital

• The orientation of the orbital

• The size and energy level of the orbital

• The spin of the electron

Answer explanation

The principal quantum number (n) indicates the size and energy level of an orbital. Higher values of n correspond to larger orbitals and higher energy levels, while the other options relate to different quantum numbers.

Why did Bohr's Model fail?

• It didn't have a nucleus

• It didn't explain the charge of electrons

• Electrons were treated only as a particle, not as a wave

Answer explanation

Bohr's Model failed because it treated electrons solely as particles, neglecting their wave-like behavior. This limitation could not account for phenomena like electron diffraction and the uncertainty principle, leading to its inadequacy.

Tags

NGSS.HS-PS4-3

What type of orbital is shown?

• p-orbital

• s-orbital

• d-orbital

• f-orbital

Answer explanation

The s-orbital is spherical in shape and can hold a maximum of two electrons. It is the simplest type of orbital, unlike p, d, and f orbitals which have more complex shapes. Therefore, the correct answer is s-orbital.

Tags

NGSS.HS-PS1-1

What type of orbital is shown.

• s-orbital

• p-orbital

• d-orbital

• f-orbital

Answer explanation

The p-orbital is characterized by its dumbbell shape and can hold a maximum of six electrons. It is distinct from the spherical s-orbital and the more complex d and f orbitals, making p-orbital the correct choice.

How does the quantum mechanical model of the atom differ from the Bohr model in terms of electron location?

• The quantum model specifies exact paths for electrons.

• The Bohr model uses probability clouds for electron location.

• The quantum model uses probability clouds for electron location.

• Both models use fixed orbits for electrons.

Answer explanation

The quantum model uses probability clouds to describe electron locations, indicating where an electron is likely to be found, unlike the Bohr model, which depicts electrons in fixed orbits.

What is the significance of the magnetic quantum number (m_l)?

• It determines the energy level of the electron.

• It determines the shape of the orbital.

• It determines the orientation of the orbital in space.

• It determines the spin of the electron.

Answer explanation

The magnetic quantum number (m_l) specifies the orientation of an orbital in space. It indicates the different orientations that orbitals can have within a given energy level and shape.

How do quantum numbers help in understanding the arrangement of electrons in an atom?

• They provide the exact location of electrons.

• They describe the energy levels, shapes, and orientations of orbitals.

• They determine the chemical properties of an element.

• They predict the color of an element.

Answer explanation

Quantum numbers describe the energy levels, shapes, and orientations of orbitals, which are essential for understanding how electrons are arranged in an atom. They do not provide exact locations or predict chemical properties.

Which orbital shape is associated with the d-subshell?

• Spherical

• Dumbbell

• Double dumbbell or cloverleaf

• Linear

Answer explanation

The d subshell is characterized by its double dumbbell or cloverleaf shape, which consists of four lobes. This distinguishes it from the spherical s, dumbbell p, and linear f orbitals.

How does the concept of orbitals in the quantum mechanical model differ from the orbits in the Bohr model?

• Orbitals are fixed paths, while orbits are probability clouds.

• Orbitals are probability clouds, while orbits are fixed paths.

• Both orbitals and orbits are fixed paths.

• Both orbitals and orbits are probability clouds.

Answer explanation

In the quantum mechanical model, orbitals represent regions of space where there is a high probability of finding an electron, while in the Bohr model, orbits are defined as fixed paths around the nucleus.