Gen Chem 1 quantum numbers and orbitals flashcards

What are quantum numbers?

Quantum numbers are values that describe the properties of atomic orbitals and the electrons in them.

Why are quantum numbers significant?

They determine electron arrangements, energy levels, and chemical behavior of atoms.

Fill in the blank: There are _____ quantum numbers.

four

True or False: Quantum numbers can have negative values.

False. Quantum numbers are always non-negative.

What do principal quantum numbers indicate?

They indicate the main energy level of an electron in an atom.

Cause → Effect: Principal quantum number increases →

Electrons are found farther from the nucleus.

What does the azimuthal quantum number represent?

It represents the shape of the orbital and is denoted by 'l'.

Comparison: Principal vs. Azimuthal Quantum Numbers.

- Principal (n): energy level - Azimuthal (l): orbital shape

What is the range for the magnetic quantum number?

It can range from -l to +l, including zero.

True or False: The spin quantum number can be 0.

False. The spin quantum number can only be +1/2 or -1/2.

How do quantum numbers relate to electron configurations?

They specify the distribution and energy of electrons in an atom.

Fill in the blank: The spin quantum number is denoted by _____ .

m_s

What are principal quantum numbers?

Principal quantum numbers (n) indicate the energy level of an electron. Values are positive integers: n = 1, 2, 3, ...

What does the azimuthal quantum number represent?

The azimuthal quantum number (l) defines the shape of the orbital. Values range from 0 to n-1: l = 0 (s), 1 (p), 2 (d), ...

True or False: Quantum number 'l' can be equal to 'n'.

False. The azimuthal quantum number 'l' must be less than 'n' (l < n).

What is the magnetic quantum number?

The magnetic quantum number (m_l) specifies the orientation of an orbital in space. It ranges from -l to +l.

Fill in the blank: For l = 1, possible m_l values are _____

m_l = -1, 0, +1.

How many values can the spin quantum number have?

The spin quantum number (m_s) has two possible values: +1/2 and -1/2.

What does the principal quantum number determine?

It determines the size and energy of the orbital. Higher 'n' means larger orbitals and higher energy.

Comparison of l = 0 and l = 2.

l = 0 (s orbital): spherical shape. l = 2 (d orbital): more complex shapes, cloverleaf.

What is the range of m_l for l = 3?

m_l can be -3, -2, -1, 0, +1, +2, +3 (7 total values).

Cause → Effect: Increasing n affects energy how?

Increasing 'n' increases the energy level of the electron, leading to greater distance from the nucleus.

What is the significance of quantum numbers?

Quantum numbers uniquely identify each electron in an atom and describe its energy and position.

True or False: m_s can equal +1.

False. The spin quantum number 'm_s' can only be +1/2 or -1/2.

What does 'l = 1' indicate?

It indicates a p orbital, which has a dumbbell shape and can hold 6 electrons.

List possible values of n.

n can be 1, 2, 3, 4, ... (positive integers only).

How do m_l values reflect orientation?

m_l values represent the spatial orientation of orbitals: e.g., m_l = 0 is along the z-axis.

Fill in the blank: The maximum number of electrons in a shell is _____

2n².

What shape does an s orbital have?

S orbitals are spherical in shape, centered around the nucleus.

What is the shape of a p orbital?

P orbitals have a dumbbell shape, oriented along the x, y, or z axes.

True or False: d orbitals are always degenerate.

False. D orbitals can have different energies depending on the surrounding environment.

How many types of p orbitals exist?

There are three types of p orbitals: px, py, and pz.

Fill in the blank: The shape of a d orbital can be described as __________.

cloverleaf or double dumbbell shaped.

Compare the number of orbitals in s, p, and d subshells.

S has 1 orbital, P has 3 orbitals, and D has 5 orbitals.

What is a key feature of f orbitals?

F orbitals are complex and can have up to 7 orbitals with various shapes.

How does the energy of orbitals increase?

The energy increases in the order: s < p < d < f.

Name the orbital shape associated with n=2, l=1.

This corresponds to a p orbital.

What does the azimuthal quantum number (l) represent?

L determines the shape of the orbital: 0=s, 1=p, 2=d, 3=f.

True or False: Orbitals can hold a maximum of 2 electrons.

True. Each orbital can hold a maximum of 2 electrons with opposite spins.

Describe the orientation of d orbitals.

D orbitals have various orientations: xy, xz, yz, x2-y2, and z2.

How do quantum numbers determine electron configuration?

Quantum numbers specify the energy level, shape, orientation, and spin of electrons, guiding their arrangement in orbitals.

True or false: Electrons fill orbitals from lower to higher energy.

True. Electrons occupy the lowest available energy orbitals first, following the Aufbau principle.

Fill in the blank: The maximum number of electrons in an s orbital is ___

2. Each orbital can hold a maximum of 2 electrons with opposite spins.

Compare 3s and 4s orbitals.

3s is lower energy than 4s. 3s is filled before 4s according to energy levels.

What is the electron configuration for Oxygen?

Oxygen (atomic number 8) has the configuration: 1s² 2s² 2p⁴.

How do periodic table groups relate to electron configuration?

Elements in the same group have similar valence electron configurations, influencing their chemical properties.

Fill in the blank: The p orbitals start filling in the ___ period.

Second. 2p orbitals are filled after the 1s and 2s orbitals.

What are the possible values for the azimuthal quantum number (l)?

l can be 0, 1, 2, or 3, representing s, p, d, and f orbitals respectively.

Cause → Effect: What happens when an electron moves to a higher energy level?

The electron absorbs energy. This can occur due to heat, light, or electricity.

How are noble gases significant in electron configuration?

Noble gases have complete outer electron shells, making them stable and unreactive.

What is the electron configuration for Chlorine?

Chlorine (atomic number 17) has the configuration: 1s² 2s² 2p⁶ 3s² 3p⁵.

True or false: 3d orbitals fill before 4s orbitals.

False. 4s orbitals fill before 3d despite being of higher principal quantum number.