A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
atomic number 93
noun
1.
a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
neptunium
Np