Atoms, Molecules, and Ions Quiz 2.1-2

Who proposed the plum-pudding model of the atom?

• John Dalton

• J. J. Thomson

• Ernest Rutherford

• Marie Curie

What is the charge of an electron?

• Positive

• Negative

• Neutral

• Variable

Which type of radiation is unaffected by electric fields?

• Alpha (a) rays

• Beta (B) rays

• Gamma (y) rays

• All of the above

What is the mass of an electron?

• 1.67 × 10^-27 kg

• 9.11 × 10^-31 kg

• 1.67 × 10^-24 kg

• 9.11 × 10^-28 kg

Who discovered the existence of protons?

• J. J. Thomson

• Ernest Rutherford

• James Chadwick

• Marie Curie

What is the charge of a proton?

• Positive

• Negative

• Neutral

• Variable

What is the charge of an alpha (a) particle?

• Positive

• Negative

• Neutral

• Variable

What is the charge of a beta (B) particle?

• Positive

• Negative

• Neutral

• Variable

What is the charge of a gamma (y) particle?

• Positive

• Negative

• Neutral

• Variable

What did Rutherford's a-scattering experiment reveal about the atom?

• The atom is mostly empty space

• The atom is a solid sphere

• The atom is a plum-pudding

• The atom is a watermelon