# Arrange the elements in decreasing order of first ionization energy

Question 1

Consider the atoms

A) chlorine B) iodine C) bromine

Arrange them in order of decreasing first ionization energy.

a) A, B, C

b) B, A, C

c) A, C, B

d) C, B, A

e) C, A, B

f) B, C, A

Question 2

Arrange the elements in decreasing order of first ionization energy.

Rank from highest to lowest first ionization energy. To rank items as equivalent, overlap them.

Cs, Se, Ge , In

Part B

Arrange the elements in order of decreasing first ionization energy.

Rank from highest to lowest first ionization energy. To rank items as equivalent, overlap them.

Element X

Element Y

Element Z

Question 3

The correct answer is c. When placing the atoms in order of decreasing ionization energy, chlorine would be first because it has the highest energy. Then bromine, and finally iodine with the lowest ionization energy. The trend for the first ionization energy, is that the energy increases as you go across the periodic table from left to right and down a group. Chlorine, iodine, and bromine are all in a group. Chlorine is the highest in the group, so it will have the highest ionization energy. Iodine is the lowest in the group, so it will have the lowest ionization energy.

Sc Ge In Ce

X ,Y ,Z

First the answer to another of your Qs: The Heisenberg Uncertainty Principle – Chemistry Question PLEASE HELP! I’ve tried to work it out 4 times!? The uncertainty of 9% also enters into the equation. The answer given by the non-selected best answerer gives that; so the uncertainty is 3.0 E-10 m or 3.0 E-4 um or 3.0 Angstroms.

Here: decreasing 1st ionization energy is APPROXimately inversely related to atomic radius: ioniz275 < ioniz185 < ioniz112

Listed in decreasing 1st ionization (from source)

1) The order of decreasing first ionization energy is

Se > Ge > In > Cs

Se VIaA group and 4 the period.

Ge  IV A group and 4 period

In IIIA and 4 period

Cs IA and 7 th period

2) Br > Se > Ge > K > Ca roghly the order of electron affinity values

3)most positive to most negative EA values

He , As, Cs, Te, Br

first two have stable valenc econfigurations.

4) Cl > Se

C >P

Ca > Sr

Br > Ge  order of first ionization energy

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