(have 1 valence electron in the outermost shell) Hydrogen has the electronic configuration 1. Although Mendeleev arranged the elements in the increasing order of their atomic masses, there were instances where he had placed an element with a slightly higher atomic mass before an element with a slightly lower atomic mass. Key words: hydrogen; position of; Periodic Table; trends; hydrogen bonding PROLOGUE In addition to the numerous works in mo-lecular spectroscopy (mostly hydrogen-bonded sys- tems, particularly crystalline hydrates) it has to be recognized that our laureate was the first one that introduced modern courses of chemistry education for chemistry majors (in the early 1990‟s)at the Ss. Lithium 1s 2 2s 1. Skip to main content ; Periodic Table. Sodium 1s 2 2s 2 2p 6 3s 1. 32. Class 11 Chemistry - Hydrogen | Position of Hydrogen In the Periodic Table - Duration: 6:37. The position of hydrogen in the traditional form of the periodic table is at the head of Group 1 (the alkali metals) based on the similarity of the valence shells of this family: each of the elements possesses a half-filled s-orbital, namely, H 1s1, Li 2s1, Na 3s1, etc. For example, hydrogen reacts with halogens, oxygen, and sulphur to form compounds whose formulae are similar to those of alkali metals. The position of some elements which were misfit on the basis of atomic mass is now justified on the basis of atomic number. Due to the presence of only one electron in its 1s shell, hydrogen exhibits a dual behaviour, i.e., it resembles both alkali metals and halogens. why is position assigned to hydrogen in the modern periodic table considered anomalous - - TopperLearning.com | 99i8x2fmm Hydrogen resembles the elements of group I-A, IV-A and VII-A in some respects. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Justify the position of hydrogen in the periodic table on the basis of its electronic configuration. Metals are found on the left side and centre of the Modern Periodic Table. If the answer is not available please wait for a while and a community member will probably answer this soon. Position of hydrogen: The position of hydrogen in his periodic table is not properly defined. The Questions and Answers of Hydrogen occupies a unique position in Modern Periodic Table”. Watch Video Solution On Doubtnut App Exercise 9.3. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Hydrogen (Z=1) has electronic configuration 1s1. Due to the presence of only one electron in its 1s shell, hydrogen exhibits a dual behaviour, i.e., it resembles both alkali metals and halogens. H + Hydrogen 1s 1. Soln: Hydrogen occupies a unique position in the Modern Periodic Table because of the following reasons. Therefore, the present position of hydrogen in the modern periodic table is not completely justified. Electronic configuration: Hydrogen has one electron in its valance shell like the alkali metals H - 1s 1. Its electronic configuration is [1s 1 ]. All noble gases are at the extreme right of the table (in most table). MBD Alchemie 2,708 views. Hydrogen and alkali metals resemble in the following aspects. Watch Video Solution On Doubtnut App Exercise 9.2 Write the names of isotopes of hydrogen. However, the properties of hydrogen differ significantly from those of the other elements in Group 1. All the elements in the period have the same number of shells. That’s helium. So, it belongs to the first group and the first period of the periodic table. Hydrogen is one of the three most abundant elements present on Earth. Its electronic configuration is [1s1]. Hydrogen occupies a unique position in the modern periodic table due to the following reasons
(i) Both hydrogen and alkali metals metals have similar outer electronic configuration as both have one electron in the valence shell. Hydrogen Ncert Video Solutions - Only On Doubtnut Download Doubtnut Now Exercise 9.1 Justify the position of hydrogen in the periodic table on the basis of its electronic configuration. Justify the statement. Recent arguments in favor of placing hydrogen either separately at the top of the table or as a member of the carbon family are shown to have serious defects. Horizontal rows of the periodic table of elements are the periods. TRUE/FALSE Medium Published on 21st 08, 2020 Thanks for the A2A. Hydrogen’s position was not justified in the very old Mendeleev’s periodic table. Hydrogen loses 1 electron and behaves like electropositive alkali metals [Group 1 (IA)]. He positioned hydrogen in the first column above alkali metals. It’s a noble gas. Position of Hydrogen in the Periodic Table #Hydrogen #PeriodicTable #Chemistry. 9.1 Justify the position of hydrogen in the periodic table on the basis of its electronic configuration 2) Electropositive character: Like alkali metals ,hydrogen also loses its only electron to form hydrogen ion i.e. Accepted Answer: Though hydrogen is a non-metal, it has been placed at the top of group 1 above the alkali metals because its electronic configuration is similar to alkali metals i.e. 2 See answers SHIVAMBANDE18122005 SHIVAMBANDE18122005 Explanation: Hydrogen is the first element of the periodic table & often called protium. Modern periodic Law: The properties of elements are a periodic function of their atomic number. Ramirez-Torres4 has presented a block form table with hydrogen placed in an isolated group unrelated to either the alkali or halogen elements. Electronic configurations model how electrons are arranged in atoms. Li , K , Na , K, Rb ,Cs and Fr of group 1 of the periodic table. Hydrogen and alkali metals have similar outer electronic configuration as both have one electron in their outermost shell. Introduction and Discovery of Hydrogen - Duration: 3:10. (Those frivolous Europeans do not have such limitations, and you can freely buy tritium key chains, tritium fishing lures, probably tritium bellybutton rings if you look hard enough.) He did so because hydrogen and alkali metals have similar properties. What is the mass ratio of these isotopes? My Periodic Table is such a registered location now, and the marker you see here is screwed down with three spanner-head tamper-proof screws per manufacturers recommendation. So the answer is False . Ask questions, doubts, problems and we will help you. Thus, hydrogen was put at the top of the periodic table so that the symmetry of the modern periodic table is not disturbed. 1. Position of an element in periodic table depends upon its electronic configuration and properties. For example, argon precedes potassium because argon has atomic number 18 and potassium has 19. There are seven such periods in the table, each numbered from 1 to 7. 6:37. See that purple ‘He’ at the top right corner? Download Citation | Concerning the position of hydrogen in the periodic table | The placement of hydrogen in the periodic table has unique implications for fundamental questions of chemical behavior. Justify the statement" hydrogen occupies a unique position in modern periodic table".. Click for even more facts and information on this periodic table element. The placement of hydrogen in the periodic table has unique implications for fundamental questions of chemical behavior. Modern Periodic Table; Trends in the Modern Periodic Table; Periods. Hydrogen Hydrogen is one of the three most abundant elements present on Earth. Definition, mass & chemical names. On one hand, its electronic configuration is similar to the outer electronic configuration (ns1) of alkali metals.On the other hand, like halogens (having electronic configuration ns2np5 belonging to group 17 of the periodic table), it is short by one electron to the corresponding noble gas configuration (ns2np6). Its atomic number is 1, and it has only one electron in its valence shell. Hydrogen has been placed at the top of the alkali metal family. Hydrogen is the first element in the periodic table. 10 Periodic Table in 8K resolution 11 Other properties of Magnesium Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. It’s atomic number is 2. Justify the position of Hydrogen in the periodic table? Properties of Hydrogen are similar to properties of Halogens as electronic configurations of halogens and Hydrogen are same. 1) Electronic configuration : Like alkali metals, hydrogen also contains 1 electron in its outermost shell. Look, in the modern periodic table of elements, there are many factors on which elwments are arranged. The lanthanoids and actinoids which have properties different from other groups are placed separately at the bottom of the periodic table. Sometimes hydrogen loses electron like Group I elements and sometimes it gains electrons like those of group VII. Metalloids are found in a zig-zag manner between the metals and the non-metals. #class10#periodicclassificationofelements“Hydrogen occupies a unique position in Modern Periodic Table”.Justify the statement. Question 29. Hydrogen is the first element of the periodic table. That is why position of hydrogen is still undecided. Properties of hydrogen do not completely match any one of the above-mentioned groups. are solved by group of students and teacher of Class 10, which is also the largest student community of Class 10. The discovery of isotopes revealed another limitation of Mendeleev’s periodic table. Hydrogen gains 1 electron and behaves like electronegative halogens [Group 17 (VIIA)]. The position of hydrogen was not justified in Mendeleev’s periodic table. Justify the statement. Due to this property of hydrogen, it can be placed either in group I or group VII. It’s literally at the top right corner of the periodic table. Non-metals are found on the right side of the Modern Periodic Table. In the modern periodic table, elements are in order of atomic number in periods and groups. Mendeleev made an early periodic table. The prime factor is the proton number. 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