Wednesday, October 27, 2010

LESSON 10

Isotopes & Atoms

Atomic Number
  1. Number of protons
Atomic mass   -   Atomic #   =   # of neutrons
 (p + n)              (p)                         (n)
  • Isotopes have the same atomic number but a different mass
ISOTOPE
MASS #
ATOMIC #
# PROTONS
# NEUTRONS
Lawrencium- 257
257
103
103
154
Uranium-238
238
92
92
146
Thorium-232
232
90
90
142
Hydrogen-1
1
1
1
0




     
Manganese-56
56
25
25
31
Polonium-212
212
84
84
128
Helium-4
4
2
2
2
Oxygen-16
16
8
8
8

( SORRY! I don't know how to connect both these tables XD *me no like computers*)

Mass Spectometers
  • used to determine the abundance and mass of the isotopes of elements

.Sherilyn Tags.

posted by chemistry11 @ 8:13 PM

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