review for Chem I unit 2

How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?

• 20
• 10
• 2
• 18

How many neutrons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?

• 20
• 25
• 2
• 18

How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?

• 34
• 36
• 2
• 40

What particle provided the positive charge for an atom?

• proton 
• neutron
• electron
• nucleus

Which particle only contributes to the mass of an atom?

• Proton
• Neutron
• Electron
• Nucleus

Which particle does not contribute mass to the atom?

• Proton
• Neutron
• Electron
• Nucleus

Which particle contributes the negative charge to the atom?

• proton
• electron
• neutron
• nucleus

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

What scientist is best known for his gold foil experiment?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

Who is the first scientist to think that the atom was the smallest unit of matter?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus