Element
Fluorine
Atomic # Mass #
19
13
Protons
BELLWORK 9/17
Electrons Neutrons
14

SCIENTIFIC NOTATION
• Used to make very large and very small numbers easier to work with.
• In one drop of water there are
1,700,000,000,000,000,000,000
• Or
• 1.7 x 10 21

YOUR SETUP
1.7 x 10 21
Part 2: EXPONET
PART 1: BASE
NUMBER

PART ONE: THE BASE NUMBER
• Write: A number between 1.0 and 9.9
• Move the decimal left or right until it is between 1.0 and 9.9
• Don’t forget to round off the extra
• 2476 -> 2.5
• 0.008723564 -> 8.7

PART TWO: THE EXPONENT
• Write: The number of times you move the decimal
• Write: If you are moving the decimal to the right (a very small number less than one) the exponent is NEGATIVE
• Write: If you are moving the decimal to the left (a big number) the exponent is POSTIVE
• 0.00000056 would have a negative exponent
• 560 would have a positive exponent

1123
0.08729
EXAMPLES

EXPANDED FORM
• Start with the base number.
• Move the decimal in the base number however many times the exponent tells you to
• If it is a negative exponent you will move it to the
LEFT
• If it is a positive exponent you will move it to the
RIGHT

9.325 x 10 3
EXAMPLES
7.6 x 10 -4

WORKSHEET TIME