Isotope

1. Isotope -Atoms of an element that have the same # of protons but a different # of neutrons

2. Isotope -Atoms of an element that have the same # of protons but a different # of neutrons Carbon - 12 protons neutrons 6 6 total number of particles In nucleus Mass # ___ 12

3. Carbon - 12 protons neutrons 6 6 Mass # ___ 12 Carbon - 13 total number of particles in nucleus protons neutrons 6 7 Mass # ___ 13 Now you do Carbon-14. We’ll check in 1 minute.

4. Carbon - 14 protons neutrons 6 8 Mass # ___ 14

5. Isotope Notation • There are several different ways to write symbols for isotopes, each of which is perfectly legitimate. The other ways to write each of these hydrogen isotopes from top to bottom are: Hydrogen-1 or H-1 Hydrogen-2 or H-2 Hydrogen-3 or H-3 Example Write down the three different notations for a carbon atom with 6 protons and 6 neutrons.

6. Atoms of the same element with different masses. Isotopes have different numbers of neutrons. They can be written like this: 11 6 12 6 13 6 14 6 C C C C Isotopes: • Or they can be written like this: • C – 11 C – 12 C – 13 C – 14

7. Hydrogen Protons: 1 Neutrons: 0 Electrons: 1 H 1 1

8. Isotopes of Hydrogen

9. Hydrogen-1 • Contains 1 proton and 1 electron – as all isotopes of H must contain. • No neutrons • The most common type of H atom.

10. Hydrogen-2, deuterium • Contains 1 proton and 1 neutron in the nucleus.

11. Hydrogen-3, tritium • Contains 1 proton and 2 neutrons in the nucleus.

12. Isotopes • Chlorine exists as two isotopes, chlorine-35 and chlorine-37. • Chlorine has the atomic number 17. • Work out the number of neutrons in chlorine-35 and chlorine-37.

13. Isotopes • Chlorine- 35 • 17 protons • No. of neutrons = 35 – 17 = 18

14. Isotopes • Chlorine- 37 • 17 protons • No. of neutrons = 37 – 17 = 20

15. Drawing and Naming Isotopes