Flashcardizz Practice Unit 4 Lesson 3: Quantum Numbers

Front

What are quantum numbers?

Back

Quantum numbers are a set of numerical values that describe the unique quantum state of an electron in an atom. They include the principal quantum number (n), azimuthal quantum number (l), magnetic quantum number (ml), and spin quantum number (ms).

Front

What does the principal quantum number (n) represent?

Back

The principal quantum number (n) indicates the main energy level or shell of an electron in an atom. It can take positive integer values (1, 2, 3, ...).

Front

What does the azimuthal quantum number (l) indicate?

Back

The azimuthal quantum number (l) indicates the shape of the electron's orbital and can take integer values from 0 to (n-1).

Front

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

Back

The magnetic quantum number (ml) describes the orientation of the orbital in space and can take values from -l to +l, including zero.

Front

What does the spin quantum number (ms) represent?

Back

The spin quantum number (ms) represents the intrinsic spin of the electron, which can be either +1/2 or -1/2.

Front

How many electrons can occupy a single orbital?

Back

A single orbital can hold a maximum of 2 electrons, which must have opposite spins.

Front

What is the electron configuration of Argon (Ar)?

Back

The electron configuration of Argon is 1s² 2s² 2p⁶ 3s² 3p⁶.

Front

Which quantum numbers describe the last electron in Argon?

Back

The quantum numbers for the last electron in Argon are n=3, l=1, ml=1, ms=-1/2.

Front

What element is described by the quantum numbers 4, 0, 0, -1/2?

Back

The element described by the quantum numbers 4, 0, 0, -1/2 is Calcium (Ca).

Front

What happens to the energy of electrons as the principal quantum number (n) increases?

Back

As the principal quantum number (n) increases, the energy of the electrons also increases, and they are found farther from the nucleus.