why and how elements are arranged in a period ?

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https://www.britannica.com › science › periodic-table

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Periodic table | Definition, Elements, Groups, Charges, Trends, & Facts …
Periodic table, in chemistry, the organized array of all the chemical elements in order of increasing atomic number. When the elements are thus arranged, there is a recurring pattern called the ‘periodic law’ in their properties, in which elements in the same column (group) have similar properties.

https://en.wikipedia.org › wiki › Period_(periodic_table)

https://en.wikipedia.org › wiki › Period_(periodic_table)
Period (periodic table) – Wikipedia
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.

https://chem.libretexts.org › Bookshelves › Introductory_Chemistry › Introductory_Chemistry_(CK-12) › 06:_The_Periodic_Table › 6.04:_Modern_Periodic_Table-_Periods_and_Groups

https://chem.libretexts.org › Bookshelves › Introductory_Chemistry › Introductory_Chemistry_(CK-12) › 06:_The_Periodic_Table › 6.04:_Modern_Periodic_Table-_Periods_and_Groups
6.4: Modern Periodic Table- Periods and Groups
20 sept. 2022Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements. Periods 6 and 7 have 32 elements, because the two bottom rows that are separate from the rest of the table belong to those periods. … The periodic table is order of atomic number. A is a horizontal …

https://chem.libretexts.org › Bookshelves › Introductory_Chemistry › Book:_Introductory_Chemistry_Online_(Young) › 01:_Measurements_and_Atomic_Structure › 1.2:_Organization_of_the_Elements_-_The_Periodic_Table

https://chem.libretexts.org › Bookshelves › Introductory_Chemistry › Book:_Introductory_Chemistry_Online_(Young) › 01:_Measurements_and_Atomic_Structure › 1.2:_Organization_of_the_Elements_-_The_Periodic_Table
1.2: Organization of the Elements – The Periodic Table
22 sept. 2022Chemists typically place elements in order of increasing atomic numbers in a special arrangement that is called the periodic table. The periodic table is not simply a grid of elements arranged numerically. In the periodic table, the elements are arranged in horizontal rows called (numbered in blue) and vertically into columns called groups.

https://en.wikipedia.org › wiki › Periodic_table

https://en.wikipedia.org › wiki › Periodic_table
Periodic table – Wikipedia
The periodic table, also known as the periodic table of the elements, arranges the chemical elements into rows (periods) and columns (groups). It is an organizing icon of chemistry and is widely used in physics and other sciences.

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The periodic table, electron shells, and orbitals – Khan Academy
By convention, elements are organized in the periodic table, a structure that captures important patterns in their behavior. Devised by Russian chemist Dmitri Mendeleev (1834-1907) in 1869, the table places elements into columns— groups —and rows— periods —that share certain properties.

https://chem.libretexts.org › Bookshelves › Inorganic_Chemistry › Supplemental_Modules_and_Websites_(Inorganic_Chemistry) › Descriptive_Chemistry › Periodic_Trends_of_Elemental_Properties › The_Periodic_Law

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The Periodic Law – Chemistry LibreTexts
30 juin 2023The Periodic Law. In 1869, Dmitri Mendeleev and Lothar Meyer individually came up with their own periodic law when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically. Meyer based his laws on the atomic volume (the atomic mass of an divided by the density of its solid form), this property is called Molar volume.

https://www.bbc.co.uk › bitesize › guides › zv2f3k7 › revision › 2

https://www.bbc.co.uk › bitesize › guides › zv2f3k7 › revision › 2
Groups and periods – The periodic table – GCSE Chemistry (Single … – BBC
The periodic table is a chart of all the elements arranged in increasing atomic number. Part of Chemistry (Single Science) Atomic structure and the periodic table Remove from My Bitesize…

https://simple.wikipedia.org › wiki › Periodic_table

https://simple.wikipedia.org › wiki › Periodic_table
Periodic table – Simple English Wikipedia, the free encyclopedia
The atomic number of an element is the same as the number of protons in that particular nucleus of an atom. In the periodic table the elements are arranged into periods and groups. A row of elements across the table is called a period. Each period has a number; from 1 to 8. Period 1 has only 2 elements it: hydrogen and helium. 2 and …

https://www.bbc.co.uk › bitesize › guides › zxmmsrd › revision › 2

https://www.bbc.co.uk › bitesize › guides › zxmmsrd › revision › 2
The periodic table – Edexcel The modern periodic table – BBC
Mendeleev made an early periodic table. In the modern periodic table, elements are in order of atomic number in periods and groups. Electronic configurations model how electrons are arranged in … lesoutrali bot