Summary of Periodic Table Trends

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Summary of Periodic Trends

Review: which direction does Zeff increase in? up and to the right

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Example: Periodic Trends
Label the following statements as either TRUE or FALSE
Ionization energy decreases when the atomic size decreases
As atomic size increases it gets easier to add an additional electron
Mg2+ is the same size as Ne since they are isoelectronic

False, ionization energy is high for small atoms
False, as atomic size increases, it is harder to add additional electrons
False, Mg2+ and Ne have the same # of electrons, but Mg2+ has more protons, so it has a higher Zeff and can pull the electrons in closer, resulting in Mg2+ having a smaller atomic radius than Ne!

Practice: Periodic Trends
Which of the following statements is correct about chlorine and phosphorus atoms?

A) The electron affinity of a chlorine atom is smaller than that of a phosphorus atom due to its smaller radius.

B) A chloride anion has higher electron affinity than a neutral chlorine atom.

C) A chlorine atom can easily gain and/or lose an electron since it has both a large electron affinity and a large ionization energy.

D) The effective nuclear charge experienced by the valence electrons in a chlorine atom is smaller than in a phosphorus atom.

E) All of the above statements are false.

I don't know

Practice: Attracting Electrons
For an S-O bond, which atom will attract the electrons within the bond more strongly? Why?

Sulfur, because it has a higher electronegativity

Oxygen, because it has a higher electronegativity

Sulfur, because it has a higher Zeff

Oxygen, because it has more valence electrons

Sulfur, because it has more protons

Oxygen, because it is smaller

I don't know

Wize High School Grade 12 Chemistry Textbook > Atomic Models and Properties of Atoms

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Summary of Periodic Trends

Example: Periodic Trends

Practice: Periodic Trends

Practice: Attracting Electrons