understanding the atom Flashcards
(7 cards)
what did Democritus say about the atom?
he said they were the ‘smallest piece of matter’
what did John Dalton say about the atom?
he also believed matter is made of atoms, but he suggested they could combine to form compounds
what did John Dalton do?
he made the beginning of our modern periodic table
what did JJ Thompson say about the atom?
his plum pudding model of the atom suggested the atom is a ball of positive charge with negative electrons embedded in it
what did Ernest Rutherford say about the atom?
a result of his experiment led him to see that most of the mass was concentrated at the centre of the atom (the nucleus), and it was charged. this was the beginning of the nuclear model
what did Niels Bohr have to say about the atom?
he further adapted the nuclear model when his experiments showed that electrons orbited the nucleus at specific distances (energy levels/shells)
what did James Chadwick have to do with the atom?
his experiments provided the evidence to show the existence of neutrons in the nucleus
