Question

True or False
In Mendeleev's periodic table, elements are arranged in an increasing order of their atomic number.

Answer 1

In Mendeleev’s periodic table, elements were arranged on the basis of the fundamental property, atomic mass and chemical properties. During Mendeleev’s work only 63 elements were known. After studying the properties of every elements, Mendeleev found that the properties of elements were related to atomic mass in a periodic way. He arranged the elements such that elements with similar properties fell into same vertical columns of periodic table.