Boyfriend: "Honey, on this Valentine's Day, I want to tell you something... I'm not rich like Robert. I don't have a mansion like Gary. I don't have a Porsche like Martin. But I do love you and I want to marry you."
Girlfriend: "Oh dear, I love you too... what was that you said about Martin?"
Dalton's atomic symbolsIn 1803, John Dalton recorded in hisnotebook“Observations on the Ultimate Particles of Bodies and their Combinations,” in which he introduced his atomic symbols. On 23 Oct 1803, he delivered a paper on the absorption of gases by water, which he concluded with a series of atomic weights for 21 simple and compound elements.« |
