Tc
Transition metal
Technetium
Z 43A 98mass 98
Atomic model
tap a particleEvery nucleon is drawn individually — 43 protons and 55 neutrons packed into the nucleus, with 43 electrons on shells outside.
43+1
Protons
Set the element — change this and it becomes a different atom.
550
Neutrons
Change only these and you get a different isotope of the same element.
43−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 98 (43 p + 55 n)
- Electron shells
- 2 · 8 · 18 · 13 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 98 u