1. Isotopes and Atomic Mass

3. Video Clip: What Makes Atoms Different
from Each other ??
 http://www.tubechop.com/watch/6024816

4. Atomic Number
 Number of Protons
 (in the Nucleus)

5. What is Atomic Mass?
 the atomic mass is the sum of the
protons and neutrons in the atom.

6. What is an isotope?
An atom that has a different number of
neutrons. (this affects the element’s mass)
Let's say an atom is missing a neutron or has
an extraneutron. That type of atom is called
an isotope.

7. How do Isotopes and Atomic Mass Relate??
 Atomic Mass = Number of Protons and Neutrons
 Isotope= element that has more or less neutrons
 The number of isotopes an element has affects its AVERAGE atomic mass.
 (i.e. element A has 6 protons and 6 neutrons) =
 Isotope of element has 6 protons and 7 neutrons…atomic mass=
 12+12+12+13…. Find average

8. Helium

9. Practice
 Make a carbon (C) with an atomic mass of 12
 Make an isotope of carbon with atomic mass of 13
 Make a Lithium with an atomic mass of 6
 Make an isotope of lithium with the atomic mass of 7
 Make a Beryllium Be

10. GAME & Exit Ticket

11. EXIT TICKET
 1. AN ISOTOPE IS AN ELEMENT WITH A DIFFERENT NUMBER OF
_____________________
 ATOMIC MASS= NUMBER OF __________+ _________________
 ATOMIC NUMBER OF HELIUM?________________________
 ATOMIC MASS OF CARBON?___________________________
 BONUS*** How many electrons does oxygen have in its outer shell?