Which of these are features of Mendeleev's periodic table? Select all correct answers Gaps left for undiscovered elements Generally ordered by relative atomic mass Generally ordered by relative abundance Changes made so that elements with similar chemical properties were grouped Grouped into rows of 8 elements

Question

Which of these are features of Mendeleev's periodic table? Select all correct answers Gaps left for undiscovered elements Generally ordered by relative atomic mass Generally ordered by relative abundance Changes made so that elements with similar chemical properties were grouped Grouped into rows of 8 elements

Answer 1

Question:The bulleted questions could be rephrased in classic 'which of the following is true' manner as following:- Were there gaps left for undiscovered elements in Mendeleev's periodic table?- Was Mendeleev's periodic table generally ordered by relative atomic mass?- Was Mendeleev's periodic table generally ordered by relative abundance?- Were changes made so that elements with similar chemical properties were grouped in Mendeleev's periodic table?- Were elements grouped into rows of 8 in Mendeleev's periodic table?Answer:Answer: 'Gaps left for undiscovered elements', 'Generally ordered by relative atomic mass' and 'Changes were made so that elements with similar chemical properties were grouped'.Explanation: Among the given options, A (Gaps left for undiscovered elements), B (Generally ordered by relative atomic mass), and D (Changes made so that elements with similar chemical properties were grouped) are correct.A. Mendeleev’s periodic table had gaps left for undiscovered elements. He noticed regularity in properties of known elements and left spaces for those undiscovered.B. Contrary to modern periodic table, Mendeleev’s periodic table was generally ordered by the relative atomic mass. This is due to the fact that electron configuration and atomic number patterns had yet not been determined at Mendeleev's epoch.D. In Mendeleev's table, elements with similar chemical properties were grouped together. This is why elements in a same group (vertical column) in the modern periodic table have similar chemical behaviors. Mendeleev's periodic table is formally not grouped into row of 8 elements (E) nor ordered by relative abundance of elements (C).Therefore, if we match these response with context:Gaps left for undiscovered elements ---> TrueGenerally ordered by relative atomic mass ---> TrueGenerally ordered by relative abundance ---> FalseChanges made so that elements with similar chemical properties were grouped ---> TrueGrouped into rows of 8 elements ---> False