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chromium
cr
question
answer
Calciuni
ca
strontium
sr
selenium
se
arsenic
as
beryllium
be
sulfur
s
phosphorus
p
silicon
si
lithium
li
titanium
ti
manganese
mn
iron
fe
cobalt
co
nickel
ni
copper
cu
zinc
zn
boron
b
krypton
kr
bromine
br
aluminum
al
magnesium
mg
sodium
na
neon
ne
fluorine
f
oxygen
o
nitrogen
n
hydrogen
h
carbon
c
potassium
k
helium
he
siliver
ag
argon
ar
chlorine
cl
molybdenum
mo