Answer:
22387Fr→22388Ra+0−1e+00ν
Step-by-step explanation:
β-decay is the decay of a neutron into a proton, which keeps the total mass the same, but increases the number of protons by 1. β-decay does this by releasing an electron, which conserves charge, and a neutrino.
Francium-223 has an atomic number of 87, so is written as
22387Fr
If the atomic number then increases by 1 to become 88, then it is a new element. Looking at the periodic table, element 88 is radium, Ra.
In the form of an equation, this is shown as
22387Fr→22388Ra+0−1e+00ν
You can check this is correct by adding up the top numbers on each side and equating them, and doing the same with the bottom numbers.
223=223+0+0
87+88+(−1)+0