Actinium has seven electron shells.
The electrons in actinium are disposed on seven energy levels.
The electrons in actinium are disposed on seven energy levels.
The electrons in actinium are disposed on seven energy levels.
Actinium has seven electron shells.
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.
Actinium has seven electron shells.
Actinium has three valence electrons.
Bromine has FOUR energy Levels.
Arsenic has 8 levels of energy.
There are 138 neutrons in actinium 89. Thank you for using WikiAnswers:)