All the isotopes of actinium has 89 protons.
All the isotopes of actinium has 89 protons.
Actinium has 89 protons and 138 neutrons (the natural isotope 227Ac).
Actinium has 89 protons and electrons; the natural isotope 227Ac has 138 neutrons.
The most common isotope of actinium, Ac-227, has 89 protons and 138 neutrons.
The number of neutrons is the difference between the atomic mass of an isotope and the atomic number. Actinium has a great number of isotopes, each with a different mass or number of neutrons.
227Ac (natural actinium) has 89 protons and electrons; also 138 neutrons.
There are 2 valence electrons in Actinium.
The most common isotope of actinium, Ac-227, has 89 protons and electrons and 138 neutrons.
Actinium has seven electron shells.
Actinium has seven electron shells.
One atom; actinium is an element, not a molecule.
Actinium has three valence electrons.