SUBATOMIC PARTICLES
Three types of subatomic particles:
- - & -
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Particle |
Symbol |
Charge |
Location |
Mass (kg) |
Mass (amu) |
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Parts of the atom:
- NUCLEUS: accounts for
- ELECTRON CLOUD: accounts for
WEIGHING ATOMS
ISOTOPES:
NUCLIDE:
To differentiate between the different
nuclides, there are several different notations that are used:
AZ E
A
E
Element - A
A = mass number
Z = atomic number
E = symbol for element
"Element" = name of element
Mass number = number of protons plus the
number of neutrons in the nucleus of that nuclide
= will always be a WHOLE number
= rounded decimal number on Periodic Table is the mass number of the MOST
COMMON isotope - not ALL isotopes of that element!
Atomic number = number of protons in the
nucleus
= whole number on the Periodic Table
So, if mass number = # of protons + # of neutrons, and atomic number = # of protons...
then # of neutrons =