They make up all the elements on the periodic table from "summary" of Atoms Under the Floorboards by Chris Woodford
The elements on the periodic table are the building blocks of everything around us. These elements make up the world we live in, from the air we breathe to the materials that make up our homes. Each element is made up of atoms, which are incredibly small particles that cannot be seen with the naked eye. In fact, atoms are so small that a single drop of water contains trillions of them. The periodic table is a way of organizing all the elements based on their properties. It is like a giant filing cabinet that helps scientists make sense of the vast array of elements that exist in the universe. The periodic table has rows and columns that group elements with similar characteristics together. For example, elements in the same column usually have similar chemical properties, while elements in the same row have similar atomic structures. What is truly remarkable about the periodic table is that all the elements are made up of just three tiny particles: protons, neutrons, and electrons. Protons and neutrons are found in the nucleus, or center, of an atom, while electrons orbit around the nucleus. The number of protons in an atom determines what element it is. For example, an atom with one proton is hydrogen, while an atom with six protons is carbon. The periodic table contains a total of 118 elements, each with its own unique combination of protons, neutrons, and electrons. Some elements, like oxygen and iron, are essential for life, while others, like gold and silver, have been prized for their beauty and value for centuries. By studying the periodic table, scientists can unlock the secrets of the universe and understand how everything in the world is connected at the most fundamental level.
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