Single chemical element, single phase (usually solid), but different 3D structures.
The prototypical examples are the allotropes of carbon.
Ciro Santilli
OurBigBook.com
$£ Sponsor €¥
中国独裁统治 China Dictatorship 新疆改造中心、六四事件、法轮功、郝海东、709大抓捕、2015巴拿马文件 邓家贵、低端人口、西藏骚乱