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Radioactive decay

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by

Harvey Buckle

on 19 May 2017

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Transcript of Radioactive decay

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Radioactive decay
Isotopes
The number of protons in the nucleus of an atom is called its
atomic number
:
the atoms of a particular element all have the same number of protons
the atoms of different elements have different numbers of protons
The
total number of protons and neutrons
in an atom is called its
mass number.
Isotopes are the atoms of an element with different numbers of neutrons. They have the same proton number, but different mass numbers.
Radioactive decay
The nuclei of some isotopes are unstable. They can split up or ‘decay’ and release radiation. Such isotopes are called radioactive isotopes or radioisotopes. When a radioactive isotope decays, it forms a different atom with a different number of protons.
Changing elements
When an atom emits alpha or beta radiation, its nucleus changes. It becomes the nucleus of a different element. This is because the number of protons in the nucleus determines which element the atom belongs to. These are the changes that occur to the number of particles in an unstable nucleus when it emits a radioactive particle:
Starter
Name and describe the THREE types of radiation.....
Now try...
Hydrogen-3 nuclei emit beta radiation....
Answer?
Example 1


Uranium-230 nuclei emit alpha radiation and become nuclei of thorium-226:




Remember that an alpha particle is identical to a helium nucleus. Notice that:
the mass number goes down by 4
the atomic number goes down by 2
Aim
To know how and why atoms decay and change into new elements
PGT day!!!
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