Download Persistence: Symbol Of ELEMENT Na

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Proton Number (or Atomic Number)
The number of protons in an atom
Represented by symbol Z
Tells us the number of electrons in atom also
Atoms of different elements have different Z
Nucleon Number (or Mass Number)
The total number of protons & neutrons in an atom
Represented by symbol A
Mass of an atom depends on the number of protons and neutrons (electrons negligible)
Nucleon Number (Mass Number) (A) = Number of Protons + Number of Neutrons
Nucleon and Proton Numbers are included when representing an element in symbols.
Nucleon
Number (A)
Proton
Number (Z)
Symbol
Of
ELEMENT
Nucleon number or
Mass number
Chemical
Symbol
23
Na
11
Proton number or
Atomic number
Persistence:
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guts”
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