Atomic Theory and the Mole

Who was the first person to ever talk about the atom?

• Dalton
• Rutherford
• Democritus

How did Rutherford discover the proton?

• Cathode Ray Tube
• Gold Foil Experiment
• Planetary Model
• Plum Pudding Model

Who stated that all atoms of the same element are exactly alike?

• Democritus
• Dalton
• Thomson
• Bohr

Rutherford's gold foil experiment provided evidence that.....

• negative and positive charges are spread out evenly throughout the atom.
• alpha particles have a positive charge.
• gold is not as dense as previously thought.
• there is a dense positively charged nucleus at the center of an atom.

How many atoms are in 1.50 moles of fluorine gas?

• 6.022 × 10²³

• 9.03 × 10²³

• 18.98

• 1.81 × 10²⁴

What do these isotopes of carbon all have in common?

• neutrons & mass number

• atomic number and neutrons

• atomic number, protons and electrons

• protons, atomic number, and mass number

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

In a correctly written symbol what would be located in the "A" position?

• number of neutrons
• atomic number
• number of electrons 
• mass number

What quantities vary between isotopes of an element?

• protons, electrons, and atomic mass
• protons, electrons, and atomic number
• neutrons and electrons
• neutrons and atomic mass

How many neutrons does an atom of the isotope Neon-22 have?

• 12
• 10
• 22
• 20