英文關鍵字
13th
2nd
atom
atomic
block
boron
chemical
cosmic
crust
earths
electron
element
group
metalloid
nucleosynthesis
number
period
ray
shell
solar
spallation
structure
supernovae
symbol
system
英文關鍵字
13th
2nd
atom
atomic
block
boron
chemical
cosmic
crust
earths
electron
element
group
metalloid
nucleosynthesis
number
period
ray
shell
solar
spallation
structure
supernovae
symbol
system