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Rank the following elements in order of decreasing ionization energy.

Calcium, Carbon, Magnesium, Oxygen, and Silicon.

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Final answer:

The elements ranked in order of decreasing ionization energy are Oxygen, Carbon, Silicon, Magnesium, and Calcium.

Step-by-step explanation:

Ionization energy is the amount of energy required to remove an electron from an atom or ion. In general, ionization energy increases from left to right across a period and decreases from top to bottom within a group on the periodic table.

Ranking the elements in order of decreasing ionization energy:

  1. Oxygen: Oxygen has the highest ionization energy because it is located in the top right corner of the periodic table.
  2. Carbon: Carbon is located to the left of oxygen and has a slightly lower ionization energy.
  3. Silicon: Silicon is located below carbon and has a lower ionization energy compared to carbon.
  4. Magnesium: Magnesium is located to the left of silicon and has a lower ionization energy compared to silicon.
  5. Calcium: Calcium is located below magnesium and has the lowest ionization energy among the given elements.
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