1-11 Various scientists Flashcards
Democritus coined the term _______ which means ________
Democritus coined the term atomos which means not able to be divided
Democritus said that an atom…
Would eventually not be able to be cut up
Democritus’s model looks like
A ball
Democritus’s model still stands today because…
Because the idea that there is nothing smaller than an atom that still had properties of that type of matter is correct.
Dalton’s year
1803
Dalton Scientifically proved these three ideas about atoms:
- All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed.
- Atoms of the same element are exactly alike, and atoms of different elements are different.
- That multiple atoms can join with other atoms to make new substances.
Dalton’s model looks like…
A bowling ball
These parts of Dalton’s theory still stand today:
That atoms are the basic building blocks of all matter and That all substances are made out of atoms.
Thompson’s year
1897
Thompson proved that an atom can be…
Divided into an even smaller part
Thompson showed there were ______ charged particles, now called ______.
Thompson showed there were negatively charged particles, now called electrons.
Thompson’s model was called ______ because…
Thompson’s model was called The Plum Pudding Model because The plum represents the negativity charged particles and the pudding represents the positively charged particles.
The plum pudding model was also called the ______
Chocolate chip ice cream model
Rutherford’s year:
1909
Rutherford tested _______’s theory with his famous __________.
Rutherford tested Thompson’s theory with his famous gold foil experiment.
Rutherford found there was a ________ charged center of the atom called _______, surrounded by the _______ charged _________.
Rutherford found there was a positively charged center of the atom called nucleus, surrounded by the negatively charged electrons.
Bohr’s year:
1913
Bohr proposed that _______ moves in _________ or __________ around the _______.
Bohr proposed that electrons moves in certain paths or energy levels around the nucleus.
In bohr’s theory, levels were like…
Rungs on a ladder
Erwin Schrodinger’s & Warner Heisenberg’s year:
____
Erwin Schrodinger & Warner Heisenberg helped us understand that electrons do NOT travel in ______,; only that there are ______ where electrons are _______ to be found.
Erwin Schrodinger & Warner Heisenberg helped us understand that electrons do NOT travel in definite paths,; only that there are regions where electrons are likely to be found.
Democritus’s year
440 BCE
