Ionization energy is the energy required to remove an electron from a gaseous atom or ion.
The trend of the ionization energies of the elements can be observed in the periodic table:
• increases going from left to right of a period
• decreases going down a group
Given elements: K, Ca, Ga, Ge, As, Se, Br and Kr
Let’s check their location in the periodic table and see how they fall in the trend mentioned.
Rank these elements according to first ionization energy.
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