History of the Atom

Question 1

what did jj thompson discover

Answer 1

electrons and the plum pudding model

Question 2

who did the scattering experiment

Answer 2

ernest rutherford

Question 3

what particles were fired at the gold foil-se

Answer 3

alpha

Question 4

where did the particles go-se

Answer 4

through the foil

Question 5

what did rutherford think atoms where filled with

Answer 5

empty space and positive nucleas

Question 6

what did bohr discover

Answer 6

electrons are arranged in energy levels called shells

Question 8

what did Dalton discover

Answer 8

that atoms were solid spheres

Question 9

what did JJ Thompson conclude

Answer 9

that atoms weren’t solid spheres and that there had to be a charge and mass, and even smaller negatively charged atoms

Question 10

what does the plum pudding model show

Answer 10

ball of positive charge with electrons stuck in it

Question 11

when did Mendeleev create the periodic table?

Answer 11

1869

Question 12

difference between the plum pudding model and the nuclear model

Answer 12

ppm vs. nm
atom is mostly positive charged ball - atom is mainly negative space
negative electrons randomly inside the positive ball - negative electrons orbit the nuclear at a distance
the mass is evenly distributed - most of the mass is concentrated in the positive nuclei

Question 13

which particle was discovered to change the model of the atom

Answer 13

the electron

Question 14

what did Bohr change about the nuclear model?

Answer 14

the electrons arranged in energy shells

Question 15

why did Mendeleev change the order of some pairs of elements?

Answer 15

Mendeleev found that some elements did not fit the pattern in his table