level 12
0化学0
楼主
铍* (4号) https://tieba.baidu.com/p/2376506746
镁* (12号) https://tieba.baidu.com/p/2395628445
钙* (20号) https://tieba.baidu.com/p/2411555394
锶* (38号) https://tieba.baidu.com/p/2450564744
钡* (56号) https://tieba.baidu.com/p/2507921434
镭 (88号) https://tieba.baidu.com/p/2589335684