there are grouped in clomesand rows ad groups
Because they are!
Periods and series are used when grouping elements. Elements are listed in rows, as periods, on the periodic table so that each is grouped with others with similar properties.
based on the number of newtrons if anyone from shire oak school is reading this paige Atkins rote this LOLx.
Johann grouped together Earth, Wind, and Fire as the first three elements.
Group are based on similar properties. The elements having same chemical properties are grouped together.
the Periodic Table of elements
they are grouped by the number of valence electrons.
hydrogen
Because in the table the elements are arranged into "periods", elements belonging to the same period have similar physical/chemical properties. This in tern reflects the fact that they have a similar number of outer shell electrons.
Scientists have grouped all elements into a periodic table based on their atomic number, electron configuration, and chemical properties. The periodic table is organized into periods (rows) and groups (columns) to display trends in properties such as atomic size, electronegativity, and reactivity. This arrangement allows for easier identification and understanding of the behavior of different elements.
Transition elements
Dmitri Mendeleev