How is the modern periodic table organized?
In the modern periodic table elements are arranged in order of increasing atomic number
The modern periodic table is organized based on the atomic structure of elements. The elements are arranged in order of increasing atomic number (number of protons in the nucleus) from left to right and top to bottom. This creates columns (groups) and rows (periods) in the periodic table.
Elements in the same group have similar chemical and physical properties as they have the same number of valence electrons (outermost electrons involved in chemical bonds). There are a total of 18 groups in the modern periodic table labeled from 1 to 18.
Elements in the same period have the same number of electron shells or energy levels. As you move across the period from left to right, the number of electrons in the valence shell increases by one, resulting in a gradual change in the chemical and physical properties of the elements.
The modern periodic table also includes subgroups such as the alkali metals, alkaline earth metals, transition metals, halogens, and noble gases with similar chemical properties. The lanthanides and actinides are placed separately at the bottom of the periodic table as they have similar electronic configurations and chemical properties.
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