History of chemistry 1808, certain of his central ideas were soon adopted by most chemists. However, uncertainty persisted for half a century about how atomic theory was to be configured and applied to concrete situations; chemists in different countries developed several different incompatible atomistic systems. A paper that suggested a way out of this difficult situation was published as early as 1811 by the Italian physicist Amedeo Avogadro (1776-1856), who hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules, from which it followed that relative molecular weights of any two gases are the same as
Same-sex marriage in the Republic of Ireland Affairs, Katherine Zappone, on 18 October and the law went into effect the following day. 91 same-sex marriages were performed between 16 November and 31 December 2015, 47 of them were between men and 44 were between women. A few days ahead of the anniversary of the Marriage Equality referendum on 22 May 2016, the Department of Social Protection released statistics on the number of same-sex marriages that had taken place since November 2015. A total of 412 same-sex marriages were performed in those six months. 1,082 same-sex couples wed in Ireland in the one year following the "Marriage Act"'s