REVIEW WEEKREVIEW WEEK

Day 2Day 2

Atomic TheoryAtomic Theory

1. Who discovered the law of definite proportions and what does it state?

2. What particle was discovered by the cathode ray tube?

3. What atomic model was invented by J.J. Thompson?

4. What was discovered by the gold foil experiment?

Atomic Theory cont.Atomic Theory cont.

5. Who was key in discovering the existence of the nucleus?

Atomic StructureAtomic Structure

1. Which particles make up only a tiny fraction of the atomic mass?

2. Which two particles make up most of the mass?

3. Which particle is positively charged?– Negatively?– Neutrally?

Atomic Structure cont.Atomic Structure cont.

• Is most of the volume of an atom contained in the nucleus?

• In a neutrally charged atom, the # of p+ is ______ the # of e-

• If you know the atomic #, what do you need to out to find the mass #?

• What are isotopes?

The Mole and Avogadro’s NumberThe Mole and Avogadro’s Number

• How many atoms are in 1 mol of any atom?

• Avogadro’s # times ____ gives you the number of atoms in a sample?

• 1mol of an element weighs as much as that element’s _______

• Which has more mass, 1mol of Gold or 1mol of Lead?