Question

from the standpoint of electronic configurations determine which element will be the first and which will be the last in a period of the periodic table​

Answer 1

The standpoint is the shells of electronic conf.

If only k then period is 1

If k. L then period 2

Answer 2

Make changes to your app's default behavior and appearance by changing server-side parameter values. For example, you could change your app's color theme to match a seasonal promotion or change the start date of a sale with no need to publish an app update.