The natural isotope 227Ac has 138 neutrons.
There are 138 neutrons in actinium 89. Thank you for using WikiAnswers:)
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 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.
The most common isotope of actinium, Ac-227, has 89 protons and 138 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.
Each isotope has a different number of neutrons; Ac-227 has 138 neutrons.Number of neutrons = Mass number of an isotope - Atomic number of the element
Actinium has seven electron shells.
All the isotopes of actinium has 89 protons.
One atom; actinium is an element, not a molecule.