(a) In the Modern Periodic table, elements are arranged in the increasing order of their atomic number. This removes the anomaly regarding certain pairs of elements in Mendeleev’s periodic table.
(b) Atomic number of cobalt is 27 and nickel is 28. Hence, cobalt will come before nickel, even though its atomic mass is greater.
(c) All isotopes of the same elements have different atomic masses, but the same atomic number; therefore they are placed in the same position in the modern periodic table.Answered by Shivani Kumari | 1 year ago
The position of three elements A, B, and C in the Periodic Table are shown below– Group 16 Group 17 - - - A - - B C
(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?