Uitleg
X = xe = xenon
K = kr = krypton
N = n  = neon
R = Rn = Radon
A = Ar = Arong
H = H  
Studiehulp voor school, huiswerk & dagelijks leven
X = xe = xenon
K = kr = krypton
N = n  = neon
R = Rn = Radon
A = Ar = Arong
H = H  

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