Question

What is the atomic number of first post actinoid element ?

• A. \(101\)
• B. \(108\)
• C. \(104\)
• D. \(110\)

Hint:

Actinoids end at lawrencium (103), so the next element is the first post actinoid.

Answer 1

The Correct Option is C

Step 1: Count the series:
Actinoids are 14 elements after actinium: 90 to 103, with Ac itself as 89.

Step 2: Next element:
103 + 1 = 104, Rf (option C).

Final Answer:
104. \[ \boxed{104} \]