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Atomic models: democritus, dalton, thomson, rutherford

Study Slideshow

Where was Democritus from?

Ancient Greece

10

What did Democritus think the world was made up of?

small particles called atoms

10

Protons have the same mass as ...?

neutrons

15

What is the electric charge of electrons?

negative charge

15

Inside the nucleus of an atom, you will find ...?

neutrons and protons

15

The mass number is the total number of ...?

protons AND neutrons added together

15

The atomic number is the total number of ...?

protons in an atom

15

The symbol for the atomic number is ...

Z

15

The symbol for the mass number is ...

A

15

Did Dalton believe that atoms were soft like pudding or hard little balls?

He believed that they were tiny hard spheres

15

Who was the first person to study atoms using the scientific method?

Dalton

15

Dalton believed that atoms of the same element were all the same. In what way are they the same?

They have the same mass, size and properties

15

Dalton believed that matter is made up of indivisible particles that cannot be _________

destroyed

20

Dalton said that atoms of different elements can come together to form _________

compounds

25

Compounds are always made up of atoms of the same element?

No, for example H2O

20

Did Dalton use the scientific method to study atoms?

Yes

15