1. Isotopes QUICK NOTES Carbon-14
Element Name
Mass Number
Carbon-14
Mass Number: total # of protons & neutrons combined
Tells us how “heavy” the atom is.
Carbon-14 is heavier than Carbon-12 and Carbon-13
To find # neutrons in this isotope:
Mass Number
- Atomic Number
# neutrons
This is what’s on the Periodic Table

2. Remember! Isotopes are just different forms of the SAME ELEMENT!
Carbon-14, Carbon-13, and Carbon-12 are the SAME element, just different forms… these are isotopes.
Isotopes
Same # of protons
Same # of electrons
DIFFERENT # of neutrons