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.
All the isotopes of actinium has 89 protons.
All the isotopes of actinium has 89 protons.
There are 138 neutrons in actinium 89. Thank you for using WikiAnswers:)
The most common isotope of actinium, Ac-227, has 89 protons and electrons and 138 neutrons.
The natural isotope 227Ac has 138 neutrons.
There are 2 valence electrons in Actinium.
Neutrons are completely separate from protons, so neutrons do not have any protons, and protons do not have any neutrons.
None -- all protons are protons, which are different from neutrons.