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A period 3 element is one of the chemical elements in the third 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 begun when chemical behavior begins to repeat, meaning that elements with similar behavior fall into ...
A period on the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor. Arranged this way, elements in the same group (column) have similar chemical and physical properties, reflecting the periodic law.
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
Each distinct atomic number therefore corresponds to a class of atom: these classes are called the chemical elements. [5] The chemical elements are what the periodic table classifies and organizes. Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on.
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
Atomic number (Z): 13: Group: group 13 (boron group) Period: period 3: Block p-block Electron configuration [] 3s 2 3pElectrons per shell: 2, 8, 3: Physical properties; Phase at STP: solid
Atomic number (Z): 18: Group: group 18 (noble gases) Period: period 3: Block p-block Electron configuration [] 3s 2 3pElectrons per shell: 2, 8, 8: Physical properties; Phase at STP: gas
Atomic number (Z): 16: Group: group 16 (chalcogens) Period: period 3: Block p-block Electron configuration [] 3s 2 3pElectrons per shell: 2, 8, 6: Physical properties; Phase at STP: solid