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3. Classical element - Wikipedia

   en.wikipedia.org/wiki/Classical_element

   The five elements are associated with the five senses, and act as the gross medium for the experience of sensations. The basest element, earth, created using all the other elements, can be perceived by all five senses — (i) hearing, (ii) touch, (iii) sight, (iv) taste, and (v) smell.

4. Periodic table - Wikipedia

   en.wikipedia.org/wiki/Periodic_table

   Oxygen (1s 2 2s 2 2p 4), fluorine (1s 2 2s 2 2p 5), and neon (1s 2 2s 2 2p 6) then complete the already singly filled 2p orbitals; the last of these fills the second shell completely. [ 39 ] [ 58 ] Starting from element 11, sodium , the second shell is full, making the second shell a core shell for this and all heavier elements.

5. List of chemical elements - Wikipedia

   en.wikipedia.org/wiki/List_of_chemical_elements

   It is a tabular arrangement of the elements by their chemical properties that usually uses abbreviated chemical ... 2 4 s-block 40.078: 1.55: 1115: 1757: 0.647: 1.00: ...

6. Free element - Wikipedia

   en.wikipedia.org/wiki/Free_element

   In chemistry, a free element is a chemical element that is not combined with or chemically bonded to other elements. Examples of elements which can occur as free elements include the oxygen molecule (O 2) and carbon. [1] Other examples of free elements include the noble metals gold and platinum. [2]

7. Period (periodic table) - Wikipedia

   en.wikipedia.org/wiki/Period_(periodic_table)

   Period 2 elements involve the 2s and 2p orbitals. They include the biologically most essential elements besides hydrogen: carbon, nitrogen, and oxygen. Lithium (Li) is the lightest metal and the least dense solid element. [8] In its non-ionized state it is one of the most reactive elements, and so is only ever found naturally in compounds.

8. Period 2 element - Wikipedia

   en.wikipedia.org/wiki/Period_2_element

   A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases; a new row is started when chemical behavior begins to repeat, creating columns of elements with similar properties.

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