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ELEMENTSPROTONSNEUTRONISOTOPECOMPOUNDATOMICMETALSHALOGENALKALIPERIOD
H
V
R
N
E
U
T
R
O
N
F
V
G
K
E
D
N
U
O
P
M
O
C
L
T
T
B
L
K
X
A
P
A
V
J
B
H
L
Z
C
E
L
C
U
O
H
P
Q
W
J
F
B
K
M
O
M
A
G
D
S
J
W
S
A
I
P
E
L
I
R
T
N
R
M
L
L
U
S
O
N
V
K
V
O
K
I
W
G
A
G
O
N
T
M
L
T
R
U
K
N
E
T
I
T
U
S
F
O
Y
K
O
N
Z
X
E
Z
O
B
Q
R
Y
P
E
R
I
O
D
M
Z
P
G
P
K
P
W
C
I
M
O
T
A
B
E
O