Which of the following element belongs to the first transition series of the periodic table?

Which of the following element is not a transition element?

What type of bond do the transition elements form with themselves?

Which of the following is not a property of lanthanides?

Which is the last element of lanthanides?

Which of the following statement is correct?

Which of the following is not a very hard metal?

What is the most common oxidation state of lanthanides?