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The atomic number for actinium is 89.

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What is atomic number of Actinium?

89 is the atomic number of Actinium.


What is actinium's atomic number?

Actinium's atomic number is 89.


What is the atomic number of actinium?

Actinium, with the chemical symbol Ac, is the chemical element with the atomic number 89.


What is the lowest atomic number actinide?

The lowest atomic number actinide is actinium, with the atomic number 89.


What is actinium in the periodic table?

Actinium is a member of the actinoids family with the atomic number 89.


Lowest atomic number actinide?

Hydrogen is a none metal element. atomic number of it is 1.


How many neutrons are in Actinium-89?

There are 138 neutrons in actinium 89. Thank you for using WikiAnswers:)


What element has 89 atomic mass?

The element that has the closest mass to 89 is Yttrium(88.91).


How many neutrons in actinium?

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.


What is the atomic symbol for actinium?

Actinium = Ac


What is actinium classified under?

Actinuim is a member of the family of actinides. Actinium is a solid metal, radioactive with the atomic number 89.


What is the first element of the actinides?

The first element in the actinide series is actinium , a chemical element in the periodic table that has the symbol Ac and atomic number 89.The actinide (or actinoid) series encompasses the 15 chemical elements that lie between actinium and lawrencium on the periodic table , with atomic numbers 89-103.The actinides get their name from the first element in the series , actinium.