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問題一覧
1
Hydrogen
H
2
helium
He
3
lithium
Li
4
beryllium
Be
5
boron
B
6
carbon
C
7
nitrogen
N
8
oxygen
O
9
fluorine
F
10
neon
Ne
11
sodium
Na
12
magnesium
mg
13
aluminum
al
14
silicon
si
15
phosphorus
p
16
sulfur
s
17
chlorine
cl
18
argon
ar
19
potassium
k
20
calcium
ca
21
scandium
sc
22
titanium
ti
23
vanadium
v
24
chromium
cr
25
manganese
mn
26
iron
fe
27
cobalt
co
28
nickel
ni
29
copper
cu
30
zinc
zn
31
gallium
ga
32
germanium
ge
33
arsenia
as
34
selenium
se
35
bromine
br
36
krypton
kr
37
rubidium
rb
38
strontium
sr
39
yttrium
y
40
zirconium
zr
41
niibium
nb
42
molybdenum
mo
43
technetium
tc
44
ruthenium
ru
45
rhodium
rh
46
palladium
pd
47
silver
ag
48
cadmium
cd
49
indium
in
50
tin
sn
51
antimony
sb
52
tellurium
te
53
iodine
i
54
xenon
xe