when thorium decays by a beta, decay , a
protons from the decays into a neutron,
an electron and an electron neutrino is emitted. The new atom formed has atomic
number decreased by one while its mass number remain unchained. The atom that
fit the description above is actinium-234
The atom formed is an isobar to the former,
meaning it has same atomic mass but different
atomic number, isobars are different element with same masses.
We can write the decay equation below
234 90Th →
234 91Ac + 0 -1e
The atom formed is actinium-234.
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