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What is ionization energy and how does this term relate with reducing property of metals and its trend across a period or down a group?

Answer 1

Wyatt Adkins

Ionization energy is the energy needed to remove an electron from an atom or an ion at its gaseous state.

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Definition
Trends
Exceptions
Periodic Trends | Ionization Energy.

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Answer 2

Jose Ayala

Ionization energy is the energy required to remove an electron from an atom. Metals with lower ionization energy tend to have stronger reducing properties. Ionization energy generally decreases down a group and increases across a period.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.