Electron Config of Selenium

Selenium has atomic number 34, meaning it has 34 electrons to arrange across its orbitals. Its ground-state electron configuration is:

Full notation: `1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴`

Shorthand notation: `[Ar] 3d¹⁰ 4s² 4p⁴`

This configuration places Selenium in the P-block of the periodic table — Period 4, Group 16. The last subshell filled (the p subshell) determines its block.

SPDF notation tells you exactly: which subshell each electron occupies, how many electrons are in it, and the energy level of each group. This is far more detail than the simpler Bohr model, which only shows shell totals.

The Aufbau (building-up) principle states electrons fill the lowest available energy subshell first. For Selenium (Z=34), the filling stops at the 4p⁴ subshell.

Standard Aufbau sequence:

1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p → 6s → 4f → 5d → 6p → 7s → 5f → 6d → 7p

After filling, Selenium's configuration ends at 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴, with 6 valence electrons in its outermost subshell.

The orbital diagram of Selenium expands the configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴ into individual orbital boxes:

- Each s subshell holds max 2 electrons (1 orbital)

- Each p subshell holds max 6 electrons (3 orbitals)

- Each d subshell holds max 10 electrons (5 orbitals)

- Each f subshell holds max 14 electrons (7 orbitals)

Hund's Rule dictates that within any subshell, electrons fill each orbital singly (spin up ↑) before pairing. This avoids electron–electron repulsion. Selenium's P-block placement confirms its last orbitals are p type.

The interactive diagram above shows Selenium's complete subshell breakdown with orbital boxes for every energy level.

Follow these steps to write Selenium's electron configuration from scratch:

Step 1: Identify the atomic number: Z = 34 — this is the total number of electrons to place.

Step 2: Follow the Aufbau sequence, filling the lowest energy subshells first:

> 1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → ...

Step 3: Apply Hund's Rule inside each subshell — one electron per orbital before pairing begins.

Step 4: Apply the Pauli Exclusion Principle — each orbital holds at most 2 electrons with opposite spins.

Step 5: After filling all 34 electrons, your result should match:

> 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴

Shorthand: Replace the preceding noble gas core with its symbol:

> [Ar] 3d¹⁰ 4s² 4p⁴

Selenium has 6 valence electrons — the electrons in its highest occupied principal energy level.

As a P-block element, Selenium's valence electrons reside in p orbitals. These are the only electrons involved in chemical bonding.

| Block | Type | Max Valence e⁻ |

|---|---|---|

| s-block | Groups 1–2 | 1–2 |

| p-block | Groups 13–18 | 3–8 |

| d-block | Groups 3–12 | up to 10 |

| f-block | Lanthanides/Actinides | up to 14 |

Selenium sits in this table as a p-block element with 6 valence electrons.

→ See Selenium's valence electrons in the Bohr model for the shell-based view.

→ Electronegativity of Selenium — how strongly it attracts these electrons.