Question 561
What is the approximate ionic radius of Th4+ (in pm) according to the table?
Question 562
What is the name of the element with atomic number 89?
Question 563
What is the name of the element with atomic number 101 among the actinoids?
Question 564
What is the name of the element with atomic number 98 among the actinoids?
Question 565
What is the name of the element with atomic number 96 among the actinoids?