Which of the following is the correct order of arrangement of the first five lanthanides according to atomic number?

What is the general electronic configuration of the lanthanides?

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

Which compound is used in Ultra-violet calibration?

Which is the most stable oxidation state of actinoids?

Mild steel is used in construction.

Why do transition elements form alloys so easily?

Sc3+ is a paramagnetic ion.