/r/periodictable
The Periodic Table of Elements
The Periodic Table of Elements
Periodic Table of Elements - a tabular arrangement of the chemical elements, ordered by their atomic number (number of protons), electron configurations, and recurring chemical properties. This ordering shows periodic trends, such as elements with similar behaviour in the same column. It also shows four rectangular blocks with some approximately similar chemical properties. In general, within one row (period) the elements are metals on the left, and non-metals on the right.
The rows of the table are called periods; the columns are called groups. Six groups have names as well as numbers: for example, group 17 elements are the halogens; and group 18, the noble gases. The periodic table can be used to derive relationships between the properties of the elements, and predict the properties of new elements yet to be discovered or synthesized. The periodic table provides a useful framework for analyzing chemical behaviour, and is widely used in chemistry and other sciences.
The Russian chemist Dmitri Mendeleev published the first widely recognized periodic table in 1869. He developed his table to illustrate periodic trends in the properties of the then-known elements. Mendeleev also predicted some properties of then-unknown elements that would be expected to fill gaps in this table. Most of his predictions were proved correct when the elements in question were subsequently discovered. Mendeleev's periodic table has since been expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behaviour.
All elements from atomic numbers 1 (hydrogen) to 118 (oganesson) have been discovered or synthesized, with the most recent additions (nihonium, moscovium, tennessine, and oganesson) being confirmed by the International Union of Pure and Applied Chemistry (IUPAC) in 2015 and officially named in 2016: they complete the first seven rows of the periodic table. The first 94 elements exist naturally, although some are found only in trace amounts and were synthesized in laboratories before being found in nature. Elements with atomic numbers from 95 to 118 have only been synthesized in laboratories or nuclear reactors.[3] Synthesis of elements having higher atomic numbers is being pursued. Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories.
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What's your favorite element and why?
11:24 UTC
Periodic Acrylic table
20:34 UTC
Why is sodium (element 11) called Na since So isn't taken by any other element?
11:00 UTC
pls check out my 2 new elements
there in my acc
05:21 UTC
The Discoid Periodic Table of Chemical Elements.
The Discoid Periodic table is an alternative layout of the Modern Periodic table.
Discoid Periodic Table on Wikipedia
Discoid Periodic Table on MetaSynthesis
This table instead of having "Groups" and "Periods” possesses "Families" and "Arcs" for the representation of elements. All the elements in the column shall be identified vertically by their Family name by using the top element name. i.e., Lithium Family, Beryllium Family, and so on. Similarly, elements shall be identified horizontally by using the number of arcs. i.e., 1st arc, 2nd arc, etc. The periodic table shall be divided into two parts, namely Part "A” and Part "B”. Part "A" represents the Representative elements, whereas Part "B” represents the Transition metals.
Salient Features: Now, let's list the features of this Periodic table, as it has removed all the defects of the previous table.
• Proper Position of Hydrogen: Hydrogen has always remained a dispute among some Groups as it shares many similarities among them. But it could only be placed in any one of them, so for this reason, it was either placed in Group-I A or as a separate block at the top. But the Discoid Periodic table has solved this long-time issue by placing it at the center of the table, from where it shall share many interstitial chemical properties with other elements of different Families. There is a sense that Hydrogen underlies everything rather than being the first element because the chemical elements are mostly formed via the fusion of H and He
• Placement of "La" and "Ac": The Lanthanide and Actinide series is a series of elements placed outside the Periodic table because they are Radioactive and mostly man-made, moreover they are f-block elements. This huge problem was also got resolved by dividing the table into two portions, which provides plenty of space. Moreover, it doesn't disturb the overall periodicity of the Table.
• Better Position of Helium: Helium also carried some similar problems. Helium is an element of Group-VIII A and shares the same chemical properties as it's a Noble gas itself, but according to the electronic configuration, it's an s-block element but all the other Noble gases are p-block. This issue has been resolved by placing Helium in the 1st arc with Hydrogen, so now it will be in the s-arc and shall be connected with its Group.
• Modification of Group-B: Group-B carries the most defects of all because the Group starts from III B to VIII B, then comes I B and II B. Moreover, Group VIII B occupies three columns rather than one. This defect is solved by Part "B" which has no Groups (or Families) because there is no need for it. All Transition metals are almost chemically and physically the same, with no big difference.
Different, yet the same: The table though in appearance may look something new and extraordinary, but on closer look is the same in terms of Periodicity as only the structure has been changed which eliminated the defects.
Conclusion: In Conclusion, from the above discussion it can be said that this Table, shall remove all the defects which the previous Periodic Table upholds. Furthermore, it shall be viable for a long period of time. This version of the Periodic Table reflects the ongoing scientific endeavor to classify the world around us.
10:03 UTC
Living Periodic Table
03:43 UTC
So, I did this. Nobody got it.
19:50 UTC
Magic Elements Periodic Table For iOS
These colorful, fun, and informative periodic tables are great for elementary, middle, and high school students, as well as adults.
AppStore:
https://apps.apple.com/us/app/magic-elements-periodic-table/id6443703473
08:20 UTC
need some help with science homework
So I have mini poster project thing in science class, and I chose to do mine on francium. But there aren't many uses for it and my teacher wants everyone to find at least three uses for the element they chose and with francium I don't think she would mind if I couldn't find 3 uses. But I am wondering what uses there are for francium or at least if there is anything it can be found in. I did research and some sites said it can be used for cancer curing diagnostic, experiments, and in research. But I'm not sure how accurate that is. Can someone help me here?? If you can give an explanation in both French and English that would be appreciated
19:45 UTC
Periodic Table Said in Less than a Minute (How I did it)
01:21 UTC
Does anyone know what this is. Its got a very low melting point
02:20 UTC
people
just joined this group we should get more people to join somehow, but thanks to everyone who is in here
23:36 UTC
Does anyone have a high resolution picture of this?
08:40 UTC
I made the art of the periodic table! Each symbol is a 3D block letter to represent the element!
01:25 UTC
Quilt i made some years ago.
15:19 UTC
What is your favourite element and why?
I recently chatted to Dr Kathryn Harkup on my podcast who has recently written a book on 'The Secret Life of Elements', and the conversation turned to 'favourite elements.' As a comedian I did not have one, had not thought of it but since the conversation I am going to say I absolutely love that Mercury seems to be the elemental embodiment of the Punk rock movement, in that it did not conform to any of the rules and so people found a way to make it useful for their own causes (enter the pop punk era of the early 2000s).
The conversation was delightfully odd and nerdy and made me wonder what other people's elements are and why (you can listen to our chat here for context).
14:28 UTC
C02 and H20 question
What are all the types of compounds that when reacted with water form CO2 or carbonic Acid
01:35 UTC
So I have a chemistry test tomorrow, can someone please explain to me the development of the periodic table. I think the main points should include Newlands and Mendeleev
19:22 UTC
This video is talking about group 1 elements in periodic table
17:54 UTC
i’m officially desperate please help😭
02:14 UTC
Polonium, number 84 (Po), is the most radioactive element.
The most toxic element is plutonium.
22:09 UTC
Fun fact!
Did you know if you take the elements that coraspond to 102 92 you get no u
14:08 UTC