Consider the following elements. Which of the following is/are true about A ' , B ' , C ' and D ' ? A. Order of atomic radii: B ' < A ' < D ' < C ' B. Order of metallic character : B ' < A ' < D ' < C ' C. Size of the element : D ' < C ' < B ' < A ' D. Order of ionic radii : B ' + < A ' + < D ' + < C ' + Choose the correct answer from the options given below:

Step-by-step solution

In a group the atomic size increases due to the addition of shells as we move from one period to another. Across a period the atomic size decreases as the number of shells remain the same while the nuclear charge increases. This leads to the pulling of electrons from the outermost shell towards the nucleus thereby decreasing the size. Metallic character increases as we move down the group because the atomic size increases which lead to easy loss of electrons. On the other hand, it decreases across a period as we mo