1. Electrons in atoms
Scientific Notation

2. Scientific Notation Base x 10 exponent RULES
Base number MUST be between 1.00 and 9.99
Exponents
Numbers < 1 have a negative exponent.
Numbers >1 have a positive exponent.

3. Scientific Notation 65,000 kg  6.5 × 104 kg
Converting into Scientific Notation:
Move decimal until there’s 1 digit to its left.
# of Places moved = exponent number
Original # is >1 gets a positive exponent
Original # is <1 gets a negative exponent
65,000 kg  6.5 × 104 kg

4. D. Scientific Notation Practice Problems 2,400,000 mg 0.00256 kg
7  10-5 km
6.2  104 mm

5. Scientific Notation Type on your calculator: EXP EE EXP EE EXE 5.44 7
Calculating with Scientific Notation
(5.44 × 107 g) ÷ (8.1 × 104 mol) =
Type on your calculator:
EXP EE
EXP EE
ENTER
EXE
5.44 7
8.1 ÷ 4 =
= 670 g/mol
= 6.7 × 102 g/mol