Question

how does eletronic configuration of atom change in a period with increase in atomic number

Answer 1

In the Periodic Table, there are a number of physical properties that are not really "similar" as it was previously defined, but are more trend-like. This means is that as you move down a group or across a period, you will see a trend-like variation in the properties. There are three specific periodic trends that we will discuss. The first lesson of this chapter is devoted to the trend in atomic size in the Periodic Table. The two following this lesson will discuss ionization energy and electron affinity. Each of these trends can be understood in terms of the electron configuration of the atoms.

Answer 2

as the atomic number increases the nucleus tries to hold the electron together from the valence shell, this means the electro static for increases so it never gives but takes the electrons due to this reason..