What is the charge of the nucleus of element 89 (actinium)?

• A. +89
• B. +39
• C. +1
• D. +56

Answer: (A)

Verified step by step guidance

1. Identify the atomic number of the element, which is given as 89 for actinium. The atomic number represents the number of protons in the nucleus.
2. Recall that the charge of the nucleus is determined by the total positive charge of all the protons present, since protons each have a charge of +1 elementary charge.
3. Since actinium has 89 protons, the total positive charge of its nucleus is +89 elementary charges.
4. Understand that electrons do not affect the nuclear charge; they only influence the overall charge of the atom or ion, not the nucleus itself.
5. Therefore, the charge of the nucleus of element 89 (actinium) is +89.