The radioactive isotope ¹³¹I (atomic number 53) decays to the isotope ¹³¹Xe (atomic number 54). What type of radioactive decay is this?

Name: The radioactive isotope 131 I (atomic number 53) decays to the isotope 131 Xe (atomic number 54). What type of radioactive decay is this?
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The fact that the atomic number increases by 1 indicates that a neutron has decayed into a proton, emitting an electron (beta particle) in the process. This is characteristic of beta decay.

The Radioactive Isotope 131I (Atomic Number 53) Decays to the Isotope

The Radioactive Isotope ¹³¹I (Atomic Number 53) Decays to the Isotope