Numerical answer · +4 / −1

The number of lanthanides is x.

Answer and solution

Answer 15

No written solution for this question yet.

Study d & f Block Elements

Asked about 170 times in JEE Main since 2020.

d & f Block Elements PYQs PDF: every JEE Main question from 2020 on, with answer key. Free, no sign-in.
d & f Block Elements revision notes: every idea in the chapter, with the usual mistakes.
d & f Block Elements formula sheet: all the formulas on one sheet.
Practise all d & f Block Elements questions: chapter by topic, free online.