Question

Which of the following statement(s) is/are true about the modern form of periodic table?

• A. Properties of the elements are the periodic functions of their atomic number
• B. There are 7 periods
• C. There are 8 groups
• D. It has separate positions for the isotopes

Answer 1

Answer: (A), (B)

Properties of the elements are the periodic functions of their atomic number
There are 7 periods

Properties of elements are a periodic function of their atomic number. Using their periodicity, modern form of periodic table was prepared. Modern form of periodic table consists of 7 periods and 18 groups. Since, modern form of periodic table is arranged according to atomic number, isotopes occupy same position in periodic table.