Periodic Table of Elements List: The periodic table is an arrangement of all the elements known to man in accordance with their increasing atomic number and recurring chemical properties. They are assorted in a tabular arrangement wherein a row is a period and a column is a group. Elements are arranged from left to right and top to bottom in the order of their increasing atomic numbers.
Thus, Elements in the same group will have the same valence electron configuration and hence, similar chemical properties. Whereas, elements in the same period will have an increasing order of valence electrons. Therefore, as the energy level of the atom increases, the number of energy sub-levels per energy level increases. The first 94 elements of the periodic table are naturally occurring, while the rest from 95 to 118 have only been synthesized in laboratories or nuclear reactors. list the periodic table of elements with names
The modern periodic table, the one we use now, is a new and improved version of certain models put forth by scientists in the 19th and 20th centuries. Dimitri Mendeleev put forward his periodic table based on the findings of some scientists before him like John Newlands and Antoine-Laurent de Lavoisier. However, Mendeleev is given sole credit for his development of the periodic table.
आवर्त सारणी मनुष्य को ज्ञात सभी तत्वों की उनकी बढ़ती हुई परमाणु संख्या और आवर्ती रासायनिक गुणों के अनुसार एक व्यवस्था है। उन्हें एक सारणीबद्ध व्यवस्था में मिश्रित किया जाता है जिसमें एक पंक्ति एक आवर्त होती है और एक स्तंभ एक समूह होता है। तत्वों को उनके बढ़ते हुए परमाणु क्रमांक के क्रम में बाएं से दाएं और ऊपर से नीचे की ओर व्यवस्थित किया जाता है। इस प्रकार, एक ही समूह के तत्वों का संयोजकता इलेक्ट्रॉन विन्यास समान होगा और इसलिए, समान रासायनिक गुणधर्म होंगे। जबकि, समान आवर्त में तत्वों में संयोजकता इलेक्ट्रॉनों का बढ़ता क्रम होगा। इसलिए, जैसे-जैसे परमाणु का ऊर्जा स्तर बढ़ता है, प्रति ऊर्जा स्तर ऊर्जा उप-स्तरों की संख्या बढ़ती जाती है। आवर्त सारणी के पहले 94 तत्व प्राकृतिक रूप से पाए जाते हैं, जबकि शेष 95 से 118 तत्वों को केवल प्रयोगशालाओं या परमाणु रिएक्टरों में संश्लेषित किया गया है।
आधुनिक आवर्त सारणी, जिसका हम अभी उपयोग करते हैं, 19वीं और 20वीं शताब्दी में वैज्ञानिकों द्वारा प्रस्तुत कुछ मॉडलों का एक नया और बेहतर संस्करण है। दिमित्री मेंडेलीव ने जॉन न्यूलैंड्स और एंटोनी-लॉरेंट डी लावोज़ियर जैसे कुछ वैज्ञानिकों के निष्कर्षों के आधार पर अपनी आवर्त सारणी को सामने रखा। हालांकि, मेंडेलीव को आवर्त सारणी के विकास के लिए एकमात्र श्रेय दिया जाता है।
Mendeleev Periodic Table
Dimitri Mendeleev, widely referred to as the father of the periodic table put forth the first iteration of the periodic table similar to the one we use now. Mendeleev’s periodic law is different from the modern periodic law in one main aspect.
Mendeleev modelled his periodic table on the basis of increasing atomic mass, whereas, the modern periodic law is based on the increasing order of atomic numbers.
Even though Mendeleev’s periodic table was based on atomic weight, he was able to predict the discovery and properties of certain elements. During his time only around half of the elements known to us now were known, and most of the information known about the elements was inaccurate. Mendeleev’s Periodic Table was published in the German Journal of chemistry in 1869.
List of Periodic Table of Elements 1 to 60
List of Periodic Table of Elements 61 to 118
Why Arrange Elements in a Table?
Seeing chemical elements arranged in the modern periodic table is as familiar as seeing a map of the world, but it was not always so obvious.
The creator of the periodic table, Dmitri Mendeleev, 1869 began collecting and sorting known properties of elements like he was playing a game while travelling by train. He noticed that there were groups of elements that exhibited similar properties, but he also noticed that there were plenty of exceptions to the emerging patterns.
Incredibly, instead of giving up, he tried altering the measured property values to better fit the patterns! He also predicted that certain elements must exist which didn’t at the time – again, in an effort to get the patterns in his “game” to work out. list of elements in periodic table pdf
There were plenty of sceptics and it took years to gain international acceptance, but once newly-discovered elements matched the ones that Mendeleev predicted, his patterns could not be dismissed. In addition, some of the properties that he “fudged” were later recalculated and found to be much closer to his predictions.
Does the Modern Periodic Table Change? If So, How and Who Does That?
The periodic table as we know it today is managed by the International Union of Pure and Applied Chemistry, or IUPAC (eye-you-pack).
While much of what is in the periodic table is stable and unlikely to change, the IUPAC organization is responsible for deciding what needs to be changed. They have created criteria for what constitutes the discovery of a new element.
In addition, any new element must be assigned a temporary name and symbol, and if validated, given an official name. Such was the case when IUPAC recently reviewed elements 113, 115, 117 and 118, and decided to give them official names and symbols (goodbye, ununseptium and hello, tennessine!).
Atomic weights found within a periodic table one might think are constant. The truth is that atomic weights have changed as a function of time. Since 1899 the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) has been evaluating atomic weights and abundances. For example, Carbon had an atomic weight of 12.00 in 1902 but today it is [12.0096, 12.0116]! Times sure have changed as the source of the sample will determine the value.
Finally, IUPAC assigns collective names (lanthanoids and actinoids) and group numbering (1 to 18) and has investigated the membership of the group 3 elements.
PubChem is working with IUPAC to help make information about the elements and the periodic table machine-readable.
FAQs on Periodic Table of Elements List
Why is the periodic table so named?
The periodic table is called so because of the way the elements are arranged. All the elements are arranged in horizontal rows and columns (called periods). Some of the chemists noticed that the general physical and chemical properties of the elements repeated periodically.
What is interesting about the periodic table?
The present periodic table has room for 118 elements. Elements aren’t discovered or created in order of atomic number. Scientists are working on creating and verifying elements 119 and 120, which will change the appearance of the table, though they were working on element 120 before element 119.
How does the periodic table list its elements?
The periodic table is a graphical collection of element data. The table lists the chemical elements in order of increasing atomic number, which is the number of protons in an atom of an element. The rows (periods) and columns (groups) organize elements according to similar properties
Who invented the periodic table?
Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He is best known for formulating the Periodic Law and creating a farsighted version of the periodic table of elements
What is the rarest element in the world?
Astatine is the rarest element on Earth; only approximately 25 grams occur naturally on the planet at any given time. Its existence was predicted in the 1800s but was finally discovered about 70 years later.
Why do we need a periodic table?
The periodic table is one of the most important tools in the history of chemistry. It describes the atomic properties of every known chemical element in a concise format, including the atomic number, atomic mass and relationships between the elements
हमें आवर्त सारणी की आवश्यकता क्यों है?
आवर्त सारणी रसायन विज्ञान के इतिहास में सबसे महत्वपूर्ण उपकरणों में से एक है। यह प्रत्येक ज्ञात रासायनिक तत्व के परमाणु गुणों का संक्षिप्त प्रारूप में वर्णन करता है, जिसमें परमाणु क्रमांक, परमाणु द्रव्यमान और तत्वों के बीच संबंध शामिल हैं periodic table of elements list pdf