Indium (In)
[Kr] 4d¹⁰ 5s² 5p¹. 1 unpaired electron, period 5, group 13, p block.
Element or ion
Type a symbol, a name or an atomic number, add a charge such as Fe3+ or Cl-, or tap an element in the table. Orbitals fill from m = −l up, spin +½ first.
InIndium, Z = 49, 114.818 u
[Kr] 4d10 5s2 5p1
In full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p¹
- Blockp block
- Period5
- Group13
- Valence3
- Unpaired1
- MagneticPara
Last electron 5p
- n5shell
- l1p subshell
- m−1orbital
- s+½spin up
Step by step
- Indium has 49 electrons.
- Fill in (n + l) order: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p¹.
- Write the subshells in order of n: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p¹.
- Replace the krypton core with [Kr]: [Kr] 4d¹⁰ 5s² 5p¹.
Indium (In): the numbers
| Atomic number | 49 |
|---|---|
| Atomic mass | 114.818 u |
| Period | 5 |
| Group | 13 |
| Block | p block |
| Valence electrons | 3 |
| Unpaired electrons | 1 |
| Magnetic | paramagnetic |
| Last electron | 5p: n = 5, l = 1, m = −1, s = +1/2 |
Indium (In): quick answers
What is the electronic configuration of indium?
Indium has 49 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p¹, or [Kr] 4d¹⁰ 5s² 5p¹ in short.
How many unpaired electrons does indium have?
Indium has 1 unpaired electron, so it is paramagnetic. Put one electron in each box of a subshell before pairing (Hund’s rule) to see them.
What are the quantum numbers of the last electron of indium?
The last electron goes into 5p: n = 5, l = 1, m = −1, s = +1/2. Orbitals fill from m = −l up, spin +½ first.