Question 1
What is meant by the electron configuration of an atom?
The right answer is the one marked above.
Representing how the electrons of an atom are filled into the energy levels, in order from the nucleus outwards.
You need two things to work one out, and you already have both: the atomic number gives the number of electrons, and table 3.1 gives the maximum each level can hold. Fill from the inside, and never exceed a level's maximum.