Developing ideas of the atom

Question 1

What did people used to think before the idea that matter was made of up of atoms was taken seriously?

Answer 1

a single contrinous substance that produced four elements

earth, fire, water, air

Question 2

How did the idea of the atom develop?

Answer 2

Dalton suggested in 1803 that elements were composed of indivisible atom, each element had a different mass number

although he thought atoms could not be broken down

Question 3

How were the first sub-atomic particles discovered?

Answer 3

the discovery of radioactivity in 1896 showed that particles could come from inside the atom

the following year, electrons were discovered, which suggested there were more sub-atomic particles due to the electrons small mass and negative charge

Question 4

What was Thompson’s theory?

Answer 4

he suggested that electrons were located within the positively charged atom is circular arrays, like negative plums in a pudding of positive charge

Question 5

What was Rutherford’s discovery?

Answer 5

all the positive charge of an atom was in a tiny central nucleus

Question 6

What is the relative mass of an electronic?

Answer 6

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