The given isotope of Neptunium is [tex]^{237} _{93} Np[/tex]
Alpha decay of an isotope results in daughter nuclide with mass number less by 4 units and atomic number less by 2 units than the parent isotope.
Alpha decay of Neptunium-237 can be represented as:
[tex]^{237} _{93} Np-->^{233}_{91} Pa+^{4} _{2} He[/tex]
Beta decay of the above formed protactinium nuclide can be represented as:
[tex]^{233}_{91}Pa-->^{233} _{92} U+^{0}_{-1}e[/tex]
Gamma decay releases only energy in the form of gamma rays, the nuclide remains the same.
[tex]^{233}_{92}U-->^{233}_{92}U+[/tex]γ
The new atom formed after the given decays is [tex]^{233}_{92}U[/tex]
