The most common isotope of actinium, Ac-227, has 89 protons and 138 neutrons.
A beryllium nucleus typically contains four protons and four neutrons, making a total of 8 particles in its nucleus.
13
there are 80 protons in the nucleus of an atom of mercury
Actinium has seven electron shells.
the particles in the nucleus are Neutrons
All the isotopes of actinium has 89 protons.
Actinium has seven electron shells.
One atom; actinium is an element, not a molecule.
Actinium has three valence electrons.
Actinium has seven electron shells.
All the isotopes of actinium has 89 protons.
The electrons in actinium are disposed on seven energy levels.