chapter 2.1-2.2

Question 1

• father of the atom
• named atom “atomos which means indivisible”
• theory was discounted by other major philosophers
• theory lasted 2000 yrs

Answer 1

democritus

Question 2

each element is made of extremely small particles called atoms

all atoms of the same element are identical and atoms of different elements are different

atoms are not changed during a reaction; atoms are not created or destroyed

compounds are formed when elements react

his theories explain law of definite proportion and law of conservation of mass

Answer 2

dalton

Question 3

atoms are not changed during a reaction: atoms are not created or destroyed

Answer 3

law of conservation of mass

Question 4

law of multiple proportions

Answer 4

elements can combine the different ratios to form different compounds

Question 5

J.J Thompson

Answer 5

developed the plum pudding model(the first model of what the atom might look like)

Question 6

• studied nature of radioactivity
• made an experiment to test the plum pudding theory
• devised the gold foil experiment
• this was the discovery of the proton

Answer 6

Ernest Rutherford

Question 7

• modified rutherfords model slightly
• created planetary model
• this is a model where protons and neutrons are in the nucleus of the atom and the electrons travel in orbits like planets around the sun

Answer 7

niels bohr

Question 8

developed the most accepted view of the atom today

protons and neutrons are in the nucleus

electrons are located in the electron cloud area around the nucleus
there are areas of higher probability of finding electrons but it’s impossible to know the exact location they don’t travel in definite paths

Answer 8

erwin schrodenger