Talk:Ripanga pūmotu

He reo Pākehā ēnei wāhanga, ka waiho i konei:

Takanga tūturu

• those with solid borders have isotopes that are older than the Earth (Primordial elements)
• those with dashed borders naturally arise from decay of other chemical elements
• those with dotted borders do not occur naturally (pūmotu waihanga)
• those without borders have not been discovered yet