How Many Eggs/Chicks for a Broody?

[starrmar006]

I have a broody hen and I was wondering how many eggs can she have under her for most of her eggs to hatch and how many chicks can she have under her for them all to survive?

 

[Spartan22]

I had the same question today, someone answered 12 of her size eggs. In my opinion/hunch should be under 10 so she can cover and protect them easy from the flock and predators.