Download Isotopes - Katella HS

Isotopes
Same but different
Students will be able to identify # of
subatomic particles in isotopes.
Same but different?
 Pre-1982 penny =
3.11 g
 Post-1982 penny =
2.55 g
 Same coin…why?
 Inside different:
Pre-1982 all Cu
Post-1982 Zn & Cu
Pennies vs Isotopes
 Both kinds have
same identity
 Both have different
masses because the
insides are unique
 Unlike pennies
atoms are too small
to see
Isotopes
 Atoms with the same
# of protons but
different # of
neutrons
 Atomic # = # protons
(identity)
 Atomic mass =
protons & neutrons
in the nucleus
electron
neutron
proton
Isotopic Notation
Mass # = protons + neutrons
33
How many:
Protons? (atomic #)
S
16
Atomic #: if not given-look it up!
Neutrons?(mass # - atomic #)
Electrons? (neutral atoms)
protons = electrons
Who am I?
 An atom that
contains 14 protons?
 An atom with 10
protons?
 An atom with an
atomic number of
98?
Isotopes of Silver
 Silver – 107
 Silver – 109
Mass Number
 # protons?
 # neutrons?
 # electrons?
 # protons?
 # neutrons?
 # electrons?
Isotopes of Silver
 Silver – 107
 Silver – 109
 # protons? 47
 # neutrons? 60
 # electrons? 47
 # protons? 47
 # neutrons? 62
 # electrons? 47
Isotopes: Same # of protons, different #
neutrons (mass numbers differ)
To do list:
 HW #7: p. 872-3 (chapter 4) #1-6; p. 113 #72
 HW #8 & Power word examples (both
columns) will be turned in on Wednesday.
Arrange to check answers before test day!
 All homework makeups due by Wednesday.
 Makeup instructions and files on dropbox.com
 Login: [email protected]
 PW: molecule
 HW stamp sheet and notes due Thursday!