John Newlands & 11 groups (31 déc. 1862 – 7 mai 1863)
Description:
In 1863 English chemist John Newlands divided the then discovered 56 elements into 11 groups, based on characteristics.Ajouté au bande de temps:
Date:
31 déc. 1862
7 mai 1863
~ 4 months and 7 days