The electrons in actinium are disposed on seven energy levels.
Actinium has seven electron shells.
The electrons in actinium are disposed on seven energy levels.
Actinium has seven electron shells.
Actinium has seven electron shells.
The electrons in actinium are disposed on seven energy levels.
Berkelium has seven electron shells.
2
Actinium has three valence electrons.
All the isotopes of actinium has 89 protons.
One atom; actinium is an element, not a molecule.
All the isotopes of actinium has 89 protons.
Copernicium has 7 electron shells.