What is the atomic number of Erbium?
55
64
68
86
Correct answer is C
No explanation has been provided for this answer.
What is the atomic number of Holmium?
6
7
76
67
Correct answer is D
No explanation has been provided for this answer.
What is the atomic number of Dysprosium?
6
66
666
6666
Correct answer is B
No explanation has been provided for this answer.
What is the atomic number of Terbium?
189
43
56
65
Correct answer is D
No explanation has been provided for this answer.
What is the atomic number of Gadolinium?
3
64
8
222
Correct answer is B
No explanation has been provided for this answer.