Transcript Isotope Class Notes

Isotope Class Notes
Pair Share
• Tell your neighbor what you know about
isotopes
Isotope Video
Subatomic Particles
• Label the atom:
What are Isotopes?
• First, do you remember how to find the
number of neutrons in an atom?
• Write the equation down in your notes
What are Isotopes
• Isotopes are atoms that have a different
number of neutrons.
• An atom is still the same element if it is
missing a neutron- it’s just a different
version!
• Neutrons can be added to an atom
without altering the number of protons
and electrons it has.
Carbon Isotopes
• For example, the element carbon has 13
different isotopes!
• You are familiar with C-12 (the C stands
for carbon, and the 12 is it’s atomic
mass)
– This isotope has 6 neutrons
• C-14 (atomic mass 14) is used for
carbon dating and has 8 neutrons!
More about Isotopes
• In an isotope, the number of protons
and electrons never changes- only the
number of neutrons is different
• This means that each isotope of a
particular element has a different atomic
mass than another isotope of the same
element
– Remember: C-12 has an atomic mass of 12
and C-14 has an atomic mass of 14!
Count the Number of Protons and Neutrons
Quick Activity
•
1)
2)
3)
4)
5)
Calculate the number of neutrons there
are in the following isotopes (use your
periodic table to find the atomic
numbers)
Carbon-14
Nitrogen-15
Sulfur-35
Calcium-45
Iodine-131