Because they are!
there are grouped in clomesand rows ad groups
based on the number of newtrons if anyone from shire oak school is reading this paige Atkins rote this LOLx.
Omitting the f-block elements, there are 18 groups in the periodic table. Groups 1 and 2 contain s-block elements. Groups 3-12 contain d-block elements and groups 13-18 are made out of p-block elements. The only exception is helium is named under group 18, being a noble gas.
The modern periodic table arranges elements based on their atomic number, which is the number of protons in the nucleus. Elements with similar chemical properties are grouped together in columns called groups or families. The table is divided into periods (rows) that indicate the number of electron shells in an atom.
they are grouped by there collums
There are 18 groups in the Periodic Table of elements.
Because all of the elements in the groups or families all have similar qualities. For example, all of the elements in the noble gas family are grouped together because they are stable elements.
Non metals are grouped together because of their similar properties. They are placed in groups-15,16 and 17
Literal groups are by similar chemical properties (alkaline earth, halogens, etc.). Elements are arranged by atomic number (number of protons) and are grouped also by their state of matter. For example, metals are in the middle, liquids are grouped together, and except for Helium, gases are as well.
Non metals are grouped together because of their similar properties. They are placed in groups-15,16 and 17
Non metals are grouped together because of their similar properties. They are placed in groups-15,16 and 17
The columns are groups or families, and the rows are periods.