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Unformatted text preview: ical Charge Electrons Proton Neutron 0 1 1 –1 +1 0 · The nucleus has a positive charge (contains protons and neutrons)
· The positive charge of the nucleus is referred to as NUCLEAR CHARGE and is abbreviated Z.
· The NUCLEAR CHARGE can be determined experimentally and is equal to the number of protons and the number of electrons (in neutral atoms)
· The mass of an atom is the sum of the masses of the protons and of the neutrons A = Mass Number = Number of protons + Number of neutrons 7 Chemistry 101 Chapter 2 ATOMIC STRUCTURE
· Any nucleus is characterized by: Z = A = Nuclear Charge = number of protons Mass Number = number of protons + number of neutrons · A NUCLIDE, is an atom, characterized by: Ø a definite nuclear charge, Z (atomic number) Ø a definite Mass Number, A
· Symbolic Representation of a Nuclide: A Z Sym bol 12
6 For example: A Carbon (C) nuclide: C (Z = 6 Examples: Determine the subatomic particles for the nuclides indicated below: 1. 208 82 P b +
p = 0
n = –
e = 2. 137 56 B a +
p = 0
n = –
e = 8 A= 12) C...
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