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Of these elements, which has the greatest first ionization energy? Why? Ce, C, Cl, Ca, Cs.

Answer 1

Quite possibly chlorine.

The energy connected to the reaction is called ionization energy:

#"Element(g) "rarr " (Element")^+(g) + e^-#

Why does the trend of increasing ionization energy across a Period (from left to right) and decreasing ionization energy down a Group make intuitive sense?

As physical scientists, we ought to always take the data into account. Check out this link.

Take note that the properties we consider are atomic, not molecular.

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Answer 2

Henry Antrim

The element with the greatest first ionization energy among Ce (cerium), C (carbon), Cl (chlorine), Ca (calcium), and Cs (cesium) is Ce (cerium) because it has the highest nuclear charge and the highest effective nuclear charge due to its electron configuration.

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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.