1.4.8—Periodic Table position from IE data

Read successive-ionisation data in sequence: compare adjacent values, locate the largest change of scale, and count the electrons removed before that jump. The count gives the number of outer-shell electrons before the next electron is taken from an inner shell.

Use the outer-electron count as a group pattern for the supported s- and p-block cases, then combine it with the stated period or configuration to identify the outer sub-shells and possible element. A large jump between the seventh and eighth values therefore indicates seven outer electrons; Period 3 information supports the chlorine configuration.

Treat the jump as evidence of a shell-depth change: the next electron is closer to the nucleus and more strongly attracted. Preserve the order of the successive values and compare their scale, rather than calling any larger next value a shell jump.

The jump alone does not name an element. Check the period, supplied information and ground-state scope before writing a configuration, and keep this data-reading method distinct from explaining the four attraction factors or the general across-period trend.