Which of the following is true about lanthanides?
A. they are all radioactive
B. they are highly electropositive
C. they are very common elements
D. they have low melting and boiling points
2 answers
well, A and C are blandly not true. A quick check of physical properties https://en.wikipedia.org/wiki/Lanthanide#Physical_properties_of_the_elements shows D as not true. So....
B: they are highly electropositive