history of the atom Flashcards
what did thompson discover and when
electrons in 1897
what model did thompson come up with
plum pudding model
describe the plum pudding model
negative electrons embedded in positively charged matter
what was the first model of the atom
a sphere that was tiny and coudn’t be discovered
what did rutherford discover and when
nucleus in 1911
what model did rutherford come up with
nuclear model
describe the nuclear model
positively charged nucleus surrounded by negatively charged electrons
how did rutherford discover the nucleus
gold foil experiment
describe the gold foil experiment
alpha particles were fired at a one atom thick layer of gold foil. some rebounded, some reflected and some passed through completely
what did bohr discover and when
electron shells in 1913
describe bohrs findings
he realized there was two electrons in the outer shell and eight on each after.
what did a group of scientists discover and when
the proton in 1920
describe the group of scientists findings
the nucleus contains many positive protons
what did chadwick discover and when
neutrons in 1932
describe chadwicks findings
he found that there was no charge neutrons in the nucleus as well as the protons
