Quartets and quadruplets are groups of four. Tires and wheels for cars come in fours. There are four suits in a pack of playing cards. Table and chair legs come in fours. Energy drinks often come in four-packs.
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There are 13 cards in each suit of a standard deck of playing cards. The United States flag has 13 stripes representing the original 13 colonies. A baker's dozen consists of 13 items instead of the usual 12.
There are 18 main groups in the modern periodic table of elements.
how cells are organized into larger and larger groups to help living things survive
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The three groups of the periodic table that contain the most elements classified as metalloids are: Group 14 (Carbon group), Group 15 (Nitrogen group), and Group 16 (Oxygen group). These groups have elements such as silicon, germanium, arsenic, antimony, tellurium, and polonium that exhibit properties of both metals and nonmetals.
The main group elements are groups 1, 2, and 13 - 18.