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EXAMPLE 1

Values for the successive IE's for an unknwn element X are given in table 2. Deudce in which group of the periodic table of elements you would expect to find X. State the name of this group

SOLUTION

The largest jump in the 1E occurs between 1E2  and 1E y corresponding to ∆ 1E= 13093 kJ mol -1. This must correspond to a change in energy level; therfore X must be in group 2, the alkaline earth metals

Periodic Trends and Ionization Energy: Khan Academy Video

fig 1 Ionization energies ranging from hydrogen to calcium 

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