In JEE Mains, the inorganic chemistry part of the periodic table focuses on trends in properties of elements across periods and down groups.

Atomic Radius: It decreases across a period from left to right because the nucleus has more protons, pulling electrons closer. It increases down a group because new electron shells are added.

Ionization Energy: The energy needed to remove an electron increases across a period and decreases down a group.

Electron Affinity: It generally becomes more negative across a period and less negative down a group.

Electronegativity: It increases across a period and decreases down a group.

Metallic Character: Decreases across a period and increases down a group.

Non-metallic Character: Increases across a period and decreases down a group.

Oxidation States: Elements can show different oxidation states depending on their group. Transition metals often have multiple oxidation states.

Reactivity: For metals, reactivity increases down a group (like alkali metals). For non-metals, reactivity decreases down a group (like halogens).

These trends help predict chemical behavior, bonding, and reactions for JEE questions.