Which of the following atoms contains least number of neutrons?

Question

^92U^235..........93^NP^240.........92^U...

Answer 1

^92U^235

its a v.simple question.it needs no xplanation

Answer 2

i learned this in my first day of class

Answer 3

92 is the atomic number of uranium (i.e. how many protons the atom contains.)

235 (or 240) is the mass number of the atom (how many protons + neutrons)

So ... subtract one from the other and you have the number of neutrons.

OK?