Description : Who invented the modern Periodic table? (1) Faraday (2) Mendeleev (3) Newton (4) Bohr
Last Answer : (2) Mendeleev Explanation: Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D.
Description : Why are isotopes not considered in Mendeleev’s periodic table?Name the elements which are predicted by Mendeleev as eka –silicon and eka –aluminum
Last Answer : Ans.Because Mendeleev gave priority to similarities in properties. Germanium and gallium
Description : (a) Why do we classify elements? (b) What were the two criteria used by Mendeleev in creating his Periodic Table? ... Justify your answer. -Chemistry 9th
Last Answer : (a) It is done so as to study the properties of elements conveniently. (b) Increasing order of atomic mass and similarities in chemical properties (especially nature and formulae of oxide and hydride formed). ... at that time. (e) They will be kept at same slot as they have same chemical properties.
Description : How many elements did Mendeleev introduce the modern periodic table ?
Last Answer : Mendeleev introduced the modern periodic table with 67 elements.
Description : What did Moseley use to reorder the elements of Mendeleev periodic table?
Last Answer : Henry Moseley discovered a relation between X-ray spectra and the atomic number of chemical elements.
Description : How Mendeleev organized his periodic table?
Last Answer : By the increasing Atomic Mass.
Description : How was Mendeleev and periodic table different from those of other chemists of the time?
Last Answer : Feel Free to Answer
Description : How did Mendeleev arrange the known element in his periodic table?
Last Answer : He arranged the elements in the increasing order of their atomicmasses and repeating periodic properties.
Description : How did Mendeleev arrange the known elements in this periodic table?
Description : The names of the scientists, Newlands, Mendeleev and Meyer are associated with the development of (a) Atomic structure (b) Metallurgy (c) Periodic table of elements (d) Discovery of elements
Last Answer : Ans:(c)
Description : Mendeleev arranged the elements in his periodic table on the basis of
Last Answer : atomic mass.
Description : Who created periodic table? A. Faraday B. Lavoisier C. Arrhenius D. Mendeleev (Answer)
Last Answer : D. Mendeleev (Answer)
Description : In his periodic table, Mendeleev could not assign a correct position to
Last Answer : Hydrogen
Description : Modern periodic law had been given by (1) Moseley (2) Mendeleev (3) Lother-Mayer (4) Lavoisier
Last Answer : (1) Moseley Explanation: In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
Description : State Mendeleev Periodic Law.
Last Answer : Ans: The chemical and physical properties of the elements are periodic functions of their atomic masses.
Description : Name the person who developed a table of elements which revealed regularities in elemental properties in 1869? w) Theodore Richards x) Antoine Lavoisier y) Dmitri Mendeleev z) Svante Arrhenius
Last Answer : ANSWER: Y -- DMITRI MENDELEEV
Description : Explain the Modern Periodic Law , also define salient features of modern periodic table
Last Answer : Ans : Modern Periodic Law : Based on the concept of atomic number Bohr , Werner & Bury proposed the modern periodic law as ; The physical & chemical properties of all elements are ... periods. The physical & chemical properties of elements change from metallic to non metallic along a period.
Description : Why is Mendeleev important?
Last Answer : He is important because he was the person who invented the Periodic Table and made it how it is today
Description : Who proposed first atomic theory? (1) E. Rutherford (2) De Broglie (3) John Dalton (4) D. I. Mendeleev
Last Answer : (3) John Dalton Explanation: Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
Description : Whose name is given to alkylmagnesium halides: w) Victor Grignard x) Daniel Rutherford y) Dmitri Mendeleev
Last Answer : ANSWER: W -- VICTOR GRIGNARD
Description : Mendeleev proposed the existence of an unknown element that he called eka-aluminum. The element is now called: w) magnesium x) silicon y) gallium z) germanium
Last Answer : ANSWER: C -- GALLIUM
Description : Which of the following scientists was awarded the Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium? w) John Dalton x) Dmitri Mendeleev y) Emil Fischer z) Marie Curie
Last Answer : ANSWER: Z -- MARIE CURIE
Description : The elements of the third period of the Periodic Table are given below: periodic-classification-of-elements-chapter-wise-important-questions-class-10-science-1 (a) Which atom is bigger, Na or Mg? Why? (6) Identify the most (i) metallic and (ii) non-metallic element in Period 3. -Science
Last Answer : (a) Sodium is bigger than magnesium as it has lesser nuclear charge so there is less force of attraction between nucleus and valence electrons and less effective nuclear charge. It is, therefore, ... the most non-metallic element because it can gain electrons easily due to its smallest atomic size.
Description : When talking about the periodic table, what are the trends of precipitates as you move down the column of alkaline earth metals?
Last Answer : Homework, eh? :)
Description : What is the signal of the last element of the periodic table ?
Last Answer : Uuo The last element of the periodic table.
Description : Which is the first element in the periodic table ?
Last Answer : The first element in the periodic table is hydrogen ( H) .
Description : What is the main basis of modern periodic table ?
Last Answer : The true basis of the modern periodic table is the electron configuration.
Description : How many stages are there in Mendeleev's Periodic Table ?
Last Answer : There are 7 stages in Mendeleev's Periodic Table .
Description : In the second and third stages of the periodic table, after how many elements does religion repeat ?
Last Answer : In the case of the second and third stages of the periodic table, religion repeats itself after the eight elements.
Description : What is the main basis of periodic table ?
Last Answer : The electron configuration is the basis of the periodic table.
Description : What are the metals in the periodic table ?
Last Answer : : There is no such thing as non-metallic in the periodic table . For example: Boron ( B) Silicon ( Si) Germanium ( Ge) Arsenic ( As) Selenium ( Se) Antimony ( Sb) Tellurium ( Te)
Description : What is a Periodic Table of Elements ?
Last Answer : By classifying the elements of the same type of religion in the same category , replacing all the discovered elements , the current table of elements is called the periodic table of elements.
Description : What is the name of the last element of the periodic table ?
Last Answer : The last element of the periodic table is called Ogneson ( Og) .
Description : What is the true basis of periodic table ?
Last Answer : The true basis of the periodic table is the electron configuration.
Description : Position of Phosphorus in Periodic Table v , What is the reason ?
Last Answer : The position of phosphorus is in class V in the periodic table , because- i) the atomic number of phosphorus is divisible by 15 or 5 ii) the last layer of phosphorus atom has 5 electrons
Description : Where is the position of silicon in the periodic table ?
Last Answer : The position of silicon ( Si) in the periodic table is in phase 3 and group 14.
Description : What is the basis of periodic table ?
Last Answer : The electron configuration is the ground view of the periodic table. The periodic table was discovered in 189. Mendeleev's contribution to the invention of the periodic table is far greater.
Description : In the periodic table of elements, on moving from left to right across a period, the atomic radius – (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern
Last Answer : (1) decreases Explanation: The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. It tends to decrease across a period from ... usually increases while going down a group due to the addition of a new energy level (shell).
Description : Which metal is the heaviest in periodic table among the following? (1) Os (2) Pt (3) Pb (4) W
Last Answer : (1) Os Explanation: The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
Description : Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic Table? (1) Scandium (2) Gallium (3) Titanium (4) Germanium
Last Answer : (2) Gallium
Description : Elements present in the 2nd Group of the Periodic Table are also called ?
Last Answer : Ans alkaline earth metals
Description : Name the elements present in the 2nd Group of the Periodic Table:
Last Answer : Ans beryllium, magnesium, calcium, strontium, barium and radium
Description : What is the position of Hydrogen in the periodic table?
Last Answer : Ans. Group I, Period I
Description : (a). Which is largest in size- Cu+ , Cu+2, Cu and why? (b). which element in the periodic table has the highest ionization enthalpy? (c). Which element is more metallic in the periodic table.?
Last Answer : Ans. (a). Cu is largest due to less effective nuclear charge. It has 29 electrons, 29 protons, Cu+ has 28 electrons and 29 protons, Cu2+ has 27 electrons and 29 protons. (b). He has highest ionization enthalpy. (c). Mg is more metallic due to lower ionization energy
Description : What is base of long form periodic table?
Last Answer : Ans: Bohr burry scheme
Description : How many groups and periods are found in long form periodic table?
Last Answer : Ans: 7 periods 18 groups
Description : Which metals are generally extracted by electrolyte process? Which positions these metals generally occupy in the periodic table?
Last Answer : Ans. : Electrolytic process is used for the extraction of active metals like Na, Ca, Mg, K, Al etc. where all other methods fail. Except Al and few other metals, these metals belongs to S-block elements of periodic table.
Description : Explain the Mendeleev’s Law of classification of elements also describe advantages & disadvantages of his periodic table.
Last Answer : Ans : Mendeleeve's Law of Classification : Mendeleeve in 1869 arrange elements in order of increasing atomic masses. He placed chemically similar elements vertically beneath each other & concluded that : The ... metals. No Idea Of Atomic Structure : It failed to give the idea of atomic structure.