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Answer is: mass number is 234.
Beta decay is radioactive decay in which a beta ray and a neutrino are emitted from an atomic nucleus.
There are two types of beta decay: beta minus and beta plus.  In beta minus decay, neutron is converted to a proton and an electron and an electron antineutrino and in beta plus decay, a proton is converted to a neutron and positron and an electron neutrino, so mass number does not change.

Answer:

234 is the mass number of the resulting element that is uranium.

Explanation:

Beta-decay is nuclear process in which a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.

[tex]_Z^A\textrm{X}\rightarrow _{Z+1}^A\textrm{Y}+_{-1}^0\beta[/tex]

So, when protactinium-234 undergoes beta decay to form uranium-234 as resultant element.

The reaction can be expressed as:

[tex]_{91}^{234}\textrm{Pa}\rightarrow _{92}^{234}\textrm{U}+_{-1}^0\beta[/tex]

234 is the mass number of the resulting element that is uranium.

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