Periodic Classification Of Elements – Previous Years Questions Write the atomic numbers of two elements ‘X’ and ‘Y’ having electronic configurations 2, 8, 2 and 2, 8, 6 respectively. [CBSE 2014] [1 Marks] State the common characteristics of the following elements:Boron, Silicon, Germanium and Arsenic [CBSE 2020] [1 Marks] An element X with atomic number […]
Periodic Classification of Elements Notes Döbereiner’s triads:- Dobereiner arranged elements with similar properties into groups having three elements each and called those groups triads.When the three elements in a triad were written in the order of increasing atomic masses, the atomic mass of middle element was roughly equal to the average atomic masses of other […]
Periodic Classification of Elements Important Questions “Atomic number of an element is considered to be a more appropriate parameter than its atomic mass for a chemist.” Take the example of element X (atomic number 13) to justify this statement. How many triads did Dobereiner identify from the existing elements during his time ? Give an […]