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Mass number and atomic
number
The atomic number is the number of
protons in an atom of an element.
Number of Protons = Atomic Number
Number of Electrons = Number of Protons =
Atomic Number
Number of Neutrons = Mass Number -
Atomic Number…read more

Slide 3

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Proton number (atomic number- the number of
protons in an atomic nucleus) is conventionally
represented by the symbol Z.
Mass number- (the sum of the number of neutrons
and protons in an atomic nucleus) is represented by
the symbol A.…read more

Slide 4

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Isotopes
Isotopes are atoms of the same element,
with the same number of protons but
different numbers of neutrons.
The mass of an isotope must always be
bigger than the atomic number. Typically it
is around twice as big.…read more

Slide 5

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Different isotopes of an element have
different mass numbers, but react
chemically in exactly the same way.
Isotopes are often written like this:…read more

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