2024-2025 Notes On Periodic Trends

ApchemWiki | RecentChanges | Preferences

Difference (from prior major revision) (no other diffs)

Removed: 7d6

Changed: 19c18,25

Definition:

1) Down a Column (Group/family)

Trend:

Reason:

2) Across a row/period

Trend:

Reason:

Added: 20a27,29

Ionization Energy (IE)

Definition:

Added: 22a32,33

Trend:

Reason:

Added: 23a35

2) Across a row/period

Added: 26a39,44

Electronegativity (EN)

1) Down a Column (Group/family)

Trend:

Reason:

Added: 32a51,66

Ionic Radii/size

1)Down a Column (Group/family)

Trend:

Reason:

2a) For Metal, how does Atomic radii (AR) compare to Ionic radii (IR)

Trend:

Reason:

2b) For Non-metal, how does Atomic radii (AR) compare to Ionic radii (IR)

Trend:

Reason:

The Periodic Table (PT) is organized so that you can "see" trends for specific physical/chemical properties as you:

a) Go Down a Column (also called Group or Family)

b) Across a row/period (from L to R on PT)

The properties are:

Coulombic Force (CF):

Definition: Attractive force between the positive nucleus and valence electrons (ve^-). CF is a function:
a) Energy level of ve^- (i.e. distance ve^- is to nucleus). Higher energy level, less CF
b) # of ve^-, more ve^-, greater CF

Atomic Radii/size

1) Down a Column (Group/family)
Trend:
Reason:

2) Across a row/period
Trend:
Reason:

Ionization Energy (IE)

Definition:

1) Down a Column (Group/family)
Trend:
Reason:

2) Across a row/period
Trend:
Reason:

Electronegativity (EN)

1) Down a Column (Group/family)
Trend:
Reason:

2) Across a row/period
Trend:
Reason:

Ionic Radii/size

1)Down a Column (Group/family)
Trend:
Reason:

2a) For Metal, how does Atomic radii (AR) compare to Ionic radii (IR)
Trend:
Reason:

2b) For Non-metal, how does Atomic radii (AR) compare to Ionic radii (IR)
Trend:
Reason: