If Cf collides with an alpha particle, this particle will be in the reactants side on the equation.
So reactants side:
[tex]^{242}_{98}Cf+^4_{2^{}}\alpha^{}[/tex]
It will produce 242+4-1 = 245
And 98 + 2 = 100
So products side will be:
[tex]^{245_{}}_{100}Fm+^1_0\text{n}[/tex]
Answer:
[tex]^{245}_{100}Fm[/tex]
