Question

5) Start each section on new page
Section -
1 Select and write Correct answer
) In which of the following series all the elements are radioactive ?
a) Lanthanid
b) d-block elements
c) s-block elements
d) Actinides​

Answer 1

Answer:

actinides

Explanation:

All actinides are radioactive and release energy upon radioactive decay; naturally occurring uranium and thorium, and synthetically produced plutonium are the most abundant actinides on Earth. ... Of the actinides, primordial thorium and uranium occur naturally in substantial quantities