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Periodic Table

Consists of 8 periods and 16 groups, with 8 main groups labeled 1A to 8A and 8 secondary groups labeled 3B to 8B, 1B, 2B.

Element s

Has the electron configuration ns^(1-2).

Element p

Has the electron configuration ns^(1-2) np^(1-6) (Groups 3A-8A).

Element d

Has the electron configuration ns^(2) (n-1)d^(1-10) (Groups 3B-8B, 1B, 2B).

Element f

Has the electron configuration ns^(1-2) (n-2)f^(1-14) (n-1)d^(0-1).

Main Group Elements

Elements in the s and p blocks of the periodic table (Groups A).

Transition Elements

Elements in the d block of the periodic table (Groups B).

Rare Earth Elements

Elements in the f block of the periodic table.

Determining Element Position

The position of elements is determined by electron configurations, with specific calculations based on their outermost electrons.

Atomic Radius Trends

Atomic radius decreases across a period and increases down a group due to effective nuclear charge and increasing electron shielding.

Cation Radius

Cation radius decreases because there are more protons than electrons, leading to stronger attraction and smaller radius.

Anion Radius

Anion radius increases because there are more electrons than protons, leading to weaker attraction and larger radius.

Ionic Radius Comparison

For ions with the same charge, the radius decreases with increasing atomic number.

Electron Affinity and Ionization Energy Trends

Electron affinity decreases and ionization energy decreases as the atomic radius increases.

Ionization Energy Trend Across a Period

Ionization energy increases from left to right along a period.

Ionization Energy Trend Down a Group

Ionization energy decreases down a group.

Ionization Energy and Electron Configuration

Elements with stable electron configurations (full or half-full) have higher ionization energies.

Electronegativity Trend Across a Period

Electronegativity increases from left to right across a period.

Electronegativity Trend Down a Group

Electronegativity decreases down a group.

Metallic Character Trend

Metallic character decreases across a period and increases down a group.

Nonmetallic Character Trend

Nonmetallic character increases across a period and decreases down a group.

Noble Gases

Chemically inert elements with a full valence shell configuration (1s^2 or np^6).

Metalloids

Elements that exhibit both metallic and nonmetallic properties.

Acidity and Basicity Trends

Basicity increases down a group and decreases across a period; acidity increases across a period and decreases down a group.