In the Periodic Table of the elements, elements are arranged in a series of rows so that those with similar properties appear in vertical columns. This arrangement reflects the periodicrecurrence of similar properties as the atomic number increases. For example, the alkaline metals lie in one group (group 1) and share similar properties, such as high reactivity and the tendency to lose one electron to arrive at the noble gas electronic configuration.
Modern quantum mechanics explains these periodic trends in properties in terms of electron shells. As atomic number increases, shells fill with electrons in approximately the order shown below. The filling of each shell corresponds to a row in the table. 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s 7p
In the s-block and p-block of the periodic table, elements within the same period generally do not exhibit trends and similarities in properties (vertical trends down groups are more significant). However in the d-block, trends across periods become significant, and in the f-block elements show a high degree of similarity across periods (particularly the lanthanides).[hide]v • d • e
Periodic tablesLayoutsStandard · Inline f-block · Vertical · Full names · Names and atomic weights · Text for last · Large table · Metals and nonmetals · Blocks · Valences · Extension beyond the 7th period · Electron configurations · Atomic weights · Electronegativities · Alternatives · Crystal structure
Lists of elements byName · Atomic symbol · Atomic number · Atomic weight · Name etymology (after places, after people) · Discovery
Boiling point · Melting point · Density · Oxidation state · Abundance (in humans) · Nuclear stability · Hardness
Groups1 (Alkali metals) · 2 (Alkaline earth metals) · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 (Boron group) · 14 (Carbon group) · 15 (Pnictogens) · 16 (Chalcogens) · 17 (Halogens) · 18 (Noble gases)
Periods1 · 2 · 3 · 4 · 5 · 6 · 7 · 8
Other element categoriesMetals · Transition metals (1st row · 2nd row · 3rd row · 4th row) · Metalloids · Nonmetals · Lanthanoids · Actinoids · Rare earth elements · Platinum group metals (PGMs) · Post-transition metals
Blockss-block · p-block · d-block · f-block
The periodic table of elements is organized by periods and families or groups this means that the periods stand for the valence electrons or negatively charged atoms known as electrons in the electrons shells in the electron cloud.
Li stands for lithium in the periodic table. It is the third element with atomic number 3 and is a soft, silvery metal that is highly reactive.
Caesium is a Period 6 element.
Oxygen is in Period 2 , Group 16 ( VI A) of periodic table
Chlorine is a chemical element with the symbol Cl and atomic number 17. It is a greenish-yellow gas at room temperature and is part of the halogen group in the periodic table. Chlorine is widely used in disinfectants, PVC production, and as a chemical intermediate in various industries.
Sulfur (S, element number 16) is on the third period of the periodic table.
6th and 7th period are the longest period of the perodic table
I think it was Mendaleev's periodic table.
Phosphorus
meercury , lead
Copper
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Search: Groups on Periodic Table on google.
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Francium
Dmitri Mendeleev in 1869
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The periodic table of elements arranges all of the known chemical elements.