WBCS.LIVE practice question

What is the specialty of rare earth elements?

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

Answer options

  1. Their outermost shells are complete.
  2. Their three outermost shells are incomplete.
  3. Their two outermost shales are incomplete.
  4. Their one outermost shell is incomplete.

Correct answer and explanation

Correct answer: Their three outermost shells are incomplete.