HardScience
Next element in: H, Be, F, S, Mn, Kr, In, Gd, Tl?
Riddle
Next element in: H, Be, F, S, Mn, Kr, In, Gd, Tl?
Choose an answer
A.Plutonium
B.Lead
C.Radium
D.Fm (Fermium)
Hint: It's a 2-word phrase with 9 letters, starting with "F".
Answer
Fm (Fermium)
Why this is the answer
This sequence follows the atomic numbers (1, 4, 9, 16, 25...) which are perfect squares. The next is 92 (Uranium).
This riddle is filed under Science Riddles and rated Hard.