Models and Structure of the Atom

He proposed the "plum pudding model of the atom.

• John Dalton

• Niels Bohr

• Ernest Rutherford

• JJ Thomson

Which is the correct sequence of the scientists who made major changes in the model of the atom?

1-JJ Thomson

2-James Chadwick

3-John Dalton

4-Niels Bohr

5-Ernest Rutherford

• 2, 1, 4, 3, 5

• 5, 3, 2, 1, 4

• 3, 1, 5, 4, 2

• 4, 3, 2, 1, 5

Who discovered the nucleus of an atom?

• JJ Thomson

• John Dalton

• Ernest Rutherford

• Democritus

He proposed the first formal atomic theory of the atom.

• John Dalton

• JJ Thomson

• Niels Bohr

• Ernest Rutherford

What experiment proved a small dense positively charged nucleus, and who did it?

• gold foil experiment, Rutherford

• gold foil experiment, Thomson

• cathode ray tube experiment, Thomson

• cathode ray tube experiment, Dalton

What is the tiny, massive central part of the atom?

• Neutron

• Electron

• Proton

• Nucleus

What are electrons?

• Massive, positively charged particles

• Tiny, negatively charged particles

• Clouds of dust in the nucleus

• Neutral particles around the nucleus

The atomic mass is dependent on which two subatomic particles?

• Protons and electrons

• Protons and neutrons

• Neutrons and electrons

• Electrons and the nucleus

This is the same as the number of protons

• atomic number

• mass number

• charge

• atomic mass

Which of the following statements about subatomic particles is correct?

• Electrons are negatively charged and are the heaviest subatomic particle.

• The mass of a neutron nearly equals the mass of a proton.

• Protons are positively charged and the lightest subatomic particle.

• Electrons, protons, and neutrons all have the same mass.