WBCS.LIVE practice question

Consider the following statements: I. In Mendeleev’s periodic table, position of the isotopes was not fixed. II. In the 19th century, Mendeleev propounded periodic law is based on atomic mass. Which of the above statement(s) is/are correct?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. Only I
  2. Only II
  3. Both (a) and (b)
  4. Either of them

Correct answer and explanation

Correct answer: Both (a) and (b)