Preview (20 questions)
1 Question
30 秒前
Q.
Cesium
Hydrogen
Rhenium
2 Question
30 秒前
Q.
Radium
Uranium
Plutonium
3 Question
30 秒前
Q.
Iodine
Europium
Barium
4 Question
30 秒前
Q.
Samarium
Terbium
Dysprosium
5 Question
30 秒前
Q.
Curium
Cobalt
Beryllium
6 Question
30 秒前
Q.
Helium
Rutherfordium
Americium
7 Question
30 秒前
Q.
Gallium
Fluorine
Krypton
8 Question
30 秒前
Q.
Rubidium
Indium
Antimony
9 Question
30 秒前
Q.
Holmium
Praseodymium
Silver
10 Question
30 秒前
Q.
Antimony
Palladium
Cadmium
11 Question
30 秒前
Q.
Boron
Vanadium
Chromium
12 Question
30 秒前
Q.
Selenium
Gallium
Calcium
13 Question
30 秒前
Q.
Copper
Sodium
Arsenic
14 Question
30 秒前
Q.
Nitrogen
Phosphorus
Technetium
15 Question
30 秒前
Q.
Thulium
Holmium
Xenon
16 Question
30 秒前
Q.
Bromine
Strontium
Osmium
17 Question
30 秒前
Q.
Ytterbium
Iridium
Gold
18 Question
30 秒前
Q.
Actinium
Polonium
Francium
19 Question
30 秒前
Q.
Bismuth
Gold
Radon
20 Question
30 秒前
Q.
Oxygen
Silicon
Phosphorus