History of the Atom Flashcards
When scientists discovered electrons what did this lead to?
The plum pudding model
At the very beginning the scientists thought that the atom was a ball of…
positive charge of negative electrons embedded in it
At the very beginning the scientists thought that an atom had no…
…nucleus
The Nuclear model with Alpha particles was after the _____ ________model
Plum pudding model
The Nuclear model features
a positive nucleus, concentrated mass in the nucleus and most is empty space
What lead to the Nuclear model?
New experimental evidence lead to a scientific model being changed or replaced
What lead to change in the scientific model?
New experimental evidence lead to a scientific model being changed or replaced
what lead to the discovery of a nucleus?
very few alpha particles bounced back
What lead to the discovery of a positive nucleus?
alpha particles repelled because of a positive nucleus
What lead to the discovery of the atom being mass concentrated in the middle and mostly empty space?
Most Alpha particles went straight through
What did Niel’s Bohr discover?
That electrons orbit the nucleus at specific distances with shells
What did James Chadwick discover?
discovered that neutrons are within the nucleus
