Question

In the long form of periodic table, elements are arranged in the increasing order of :

• A. atomic mass
• B. atomic number
• C. mass number
• D. metallic character.

Answer 1

Answer: (B)

atomic number

According to Modern periodic law the physical and chemical properties of elements are the periodic functions of their atomic numbers. Elements are arranged according to increasing atomic numbers in horizontal rows called periods and elements with similar electronic configuration were placed in vertical columns called groups.

option B