In
Post-transition metal
Indium
Z 49A 115mass 114.82
Atomic model
tap a particleEvery nucleon is drawn individually — 49 protons and 66 neutrons packed into the nucleus, with 49 electrons on shells outside.
49+1
Protons
Set the element — change this and it becomes a different atom.
660
Neutrons
Change only these and you get a different isotope of the same element.
49−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 115 (49 p + 66 n)
- Electron shells
- 2 · 8 · 18 · 18 · 3
- Valence shell
- 3 electrons
- Atomic mass
- 114.82 u
Stability
Indium has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab