What is a periodic table group versus a family?

A group is a vertical column of the periodic table, while a family is a set of elements with similar chemistry that often coincides with a group. For example, group 17 is the halogen family. This tool classifies all elements by their commonly used family name.

Why do alkali metals react so violently?

Alkali metals have a single loosely held outer electron they readily give up to form a plus-one ion. This makes them extremely reactive, especially with water, releasing hydrogen gas and heat. Reactivity increases down the group from lithium to cesium.

What makes noble gases inert?

Noble gases have completely filled outer electron shells, so they have little tendency to gain, lose, or share electrons. This full-shell stability makes them chemically inert under normal conditions, though heavier ones like xenon can form a few compounds.

Metalloids such as boron, silicon, and germanium have properties between metals and nonmetals. They often behave as semiconductors, which is why silicon and germanium are central to electronics. They sit along the staircase line of the periodic table.

How are lanthanides and actinides different?

Both are inner transition metals that fill f-orbitals. Lanthanides (atomic numbers 57 to 71) are mostly stable rare-earth metals. Actinides (89 to 103) are all radioactive, and the heavier ones are synthetic, created only in reactors or accelerators.

Chemical Element Groups & Families

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The periodic table organizes the 118 known elements into families that share chemical behavior. This reference lets you browse and filter every element by its family — from the reactive alkali metals to the inert noble gases.

How it works

Elements are grouped by their outer-electron structure, which determines how they bond:

Alkali metals (group 1) — one outer electron, very reactive.
Alkaline earth metals (group 2) — two outer electrons.
Transition metals (groups 3–12) — partially filled d-orbitals.
Metalloids — semiconductor-like, along the staircase.
Nonmetals — gain or share electrons.
Halogens (group 17) — one electron short of a full shell.
Noble gases (group 18) — full outer shells, inert.
Lanthanides / actinides — f-block inner transition metals.

Selecting a family filters the list; the search box matches name, symbol, or atomic number.

Tips and notes

Reactivity of metals generally increases down a group and to the left.
Reactivity of nonmetals increases up a group and to the right.
The metalloid staircase (B, Si, Ge, As, Sb, Te) separates metals from nonmetals.