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Periodic Table Set-up - PowerPoint PPT Presentation


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Periodic Table Set-up. Periodic Trends. Atomic Radius :. 1/2 distance between 2 nuclei of the same element. Group Trend: Increases . Why: e-are being added to new energy levels further away, electron shielding occurs, so the nucleus can not pull electrons in a close. .

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slide3

Periodic Trends

Atomic Radius:

1/2 distance between 2 nuclei of the same element.

Group Trend: Increases

Why: e-are being added to new energy levels

further away, electron shielding occurs, so the nucleus can not pull electrons in a close.

Period Trend: Decreases →

Why: e-are being added to the same energy level. As the nucleus becomes stronger, the electrons are drawn in closer.

slide4

Ionization Energy:

The energy required to remove

an e-.

Group

Trend: Decrease →

Why: e-are further away (shielded) and easier to take away.

Period Trend: Increase →

Why: e-are closer to nucleus + harder to remove.

Atoms are closer to having a complete valence shell

and want to gain not lose e-.

slide5

Electron Affinity

: ability to attract e-

Group Trend:

Decreases

Why

: Electrons are harder to bring in further away with the nucleus pulling less.

Period Trend: Increases →

due to a stronger nucleus

Why:

e-

are

easier to bring in

Atoms want to complete their valence shell.

Electronegativity: ability to attract e-in a bond

→ scale of O-4

F=4.0

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Ion Size

cations (+)

: lose valence e'

Effect on Radius:

decrease due to loss of

energy level.

anions (+): gain electrons

increases due to addition

Effect on Radius :

l

,

of e- to the same energy level and not

changing the strength of the nucleus.