Electron Configuration of Indium (In)
Indium (In, Z = 49) has the electron configuration [Kr] 4d^10 5s^2 5p^1, filling 5 shells with 2, 8, 18, 18, 3 electrons.
This is the fast lane: one page, one fact, zero digressions. Read the quick answer, check the table, and if your exam needs the full derivation, the sections below walk through it step by step — in Bangla and English, like every page here. Need the whole picture instead — history, characteristics, uses, exam questions? The full Indium page is one click away.
Indium: every subshell, one by one
The table below unpacks [Kr] 4d^10 5s^2 5p^1 line by line, so you can watch Indium's 49 electrons take their seats in order of increasing energy.
| Subshell | Electrons | Total so far |
|---|---|---|
| [Kr] | 0 | 36 |
| 4d | 10 | 46 |
| 5s | 2 | 48 |
| 5p | 1 | 49 |
Electrons per shell (K, L, M…)
Grouped by principal quantum number instead of subshell, Indium carries 2 in shell 1, 8 in shell 2, 18 in shell 3, 18 in shell 4, 3 in shell 5. The outermost shell holds 3 electrons — the ones that do all the bonding.
How to derive it yourself
Follow the aufbau order (1s → 2s → 2p → 3s → 3p → 4s → 3d → …), pouring 49 electrons into orbitals of capacity 2 (s), 6 (p), 10 (d) and 14 (f) until none remain. Write the filled inner shells as the nearest noble-gas core — for Indium that gives [Kr] 4d^10 5s^2 5p^1.
Students also ask
How many electron shells does Indium have?
Indium is in period 5, so its electrons occupy 5 shells, holding 2, 8, 18, 18, 3 electrons respectively.
How many valence electrons does Indium have?
Its outermost shell holds 3 electrons, so Indium has 3 valence electrons that take part in bonding.
What is the noble-gas shorthand for Indium?
The shorthand form is exactly [Kr] 4d^10 5s^2 5p^1.