Question

I need help with two question below.

Answer 1

1, u-92

2, 237-92=145

Step-by-step explanation:

the isotopes means the element which have the same number of proton, but different neutron

92 is the atomic number

so the atomic number =proton number

so mass= neutron+ proton

shift the place and u will get this

neutron= mass -proton