636
Question 636
What is the approximate ionic radius of Er²⁺?
637
Question 637
What is the approximate ionic radius of Tb³⁺?
638
Question 638
What is the approximate atomic radius of Neodymium (Nd)?
639
Question 639
What is the name of the element with symbol Lu?
640
Question 640
What is the name of the element with atomic number 69?