Front

What is electron configuration?

Back

The distribution of electrons in an atom's orbitals, indicating the energy levels and sublevels occupied by electrons.

Front

What is the Aufbau principle?

Back

Electrons occupy the lowest energy orbitals first before filling higher energy orbitals.

Front

What is the Pauli Exclusion Principle?

Back

No two electrons in an atom can have the same set of four quantum numbers; each orbital can hold a maximum of two electrons with opposite spins.

Front

What is Hund's Rule?

Back

Electrons will fill degenerate orbitals (orbitals of the same energy) singly before pairing up.

Front

What does the notation '1s²' represent?

Back

It indicates that there are 2 electrons in the 1s orbital.

Front

How many electrons can the s, p, d, and f orbitals hold?

Back

s: 2, p: 6, d: 10, f: 14.

Front

What is the significance of noble gas notation in electron configuration?

Back

It simplifies the representation of electron configurations by using the electron configuration of the nearest noble gas as a starting point.

Front

What is the electron configuration for oxygen (O)?

Back

1s² 2s² 2p⁴.

Front

How do you determine the number of valence electrons in an element?

Back

By looking at the highest energy level (n) in the electron configuration and counting the electrons in the outermost s and p orbitals.

Front

What is the electron configuration for the element with atomic number 26 (iron, Fe)?

Back

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶.