Definition of antemortem in the Definitions.net dictionary. Meaning of antemortem. What does antemortem mean? Information and translations of antemortem in the most comprehensive dictionary definitions resource on the web.
Boron is a chemical element. It is a metalloid. Its chemical symbol is B and its atomic number is 5. It was first discovered in 1808 by the efforts of French physicist Joseph-Louis Gay-Lussac, French chemist Louis-Jaques Thenard. They reacted sodium with boric acid to separate boron element. Later it was isolated by British chemist Sir Humphry Davy independently.
The nucleus was discovered in 1911, as a result of Ernest Rutherford's efforts to test Thomson's plum pudding model of the atom. The electron had already been discovered earlier by J.J. Thomson himself. Knowing that atoms are electrically neutral, Thomson postulated that there must be a positive charge as well.