List the following in order of increasing force of attraction

1. an electron in the outer shell of carbon atom (in the ground state level) 1.1*10^(-10)m a part from nucleus.

2.an electron in the outer shell of oxegen atom (in the ground state level) 9.0*10^(-11)m a part from nucleus.

3.an electron in the outer shell of sulfur atom (in the ground state level) 1.5*10^(-10)m a part from nucleus

3 answers

I would look at the ionization potential for each of the elements. The largest ionization potential is the one with the greatest attraction.
no thing given rather then this information and this is exam question how i can look for ionization energy?
You can google "table ionization potentials".