Which of the following is not a consequence of lanthanide contraction?

Which property of actinoids cannot be explained?

Which of the following metal does not form a coloured salt?

How many series’ of transition elements are present in the periodic table?

Which of the following iswhy the atomic radii of the second and third transition series are almost same?

Which of the following lanthanide ions do not exhibit color?

Which isotope of plutonium is used in nuclear bombs?

What is the first element of the fourth transition series in the periodic table?