WBCS.LIVE practice question

Which of the following is not correct with reference to Neil Bohr's modern periodic table?

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

Answer options

  1. The last element of every period has 8 valence electrons except helium, which consists of 2
  2. Elements of groups 3 to 12 are called transition elements.
  3. Elements that have atomic numbers from 57 to 70 are called lanthanide series.
  4. The element whose atomic number is 89 to 103 is called actinide series.

Correct answer and explanation

Correct answer: Elements that have atomic numbers from 57 to 70 are called lanthanide series.