All known elements, both naturally occurring and artificially created, are represented in the Periodic Table, arranged by atomic number and following the Periodic Law.
Rows (Periods) represent energy levels, and columns (Groups) represent families of elements with similar properties and the same number of valence electrons.
The table includes Alkali Metals, Alkaline-Earth Metals, Transition Metals, Post-Transition Metals, Metalloids, Non-Metals, Halogens, and Noble Gases, each with distinct properties.
Chemical Reactivity
Elements in the same group share similar chemical properties. For example, Alkali Metals are highly reactive, while Noble Gases are mostly non-reactive.
Atomic radius decreases across a period due to increasing nuclear charge and increases down a group due to additional energy levels.
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