Elements of the second period are known as-

Correct option is D

The correct answer is (d) Bridge elements.
· Elements of the second period are referred to as bridge elements because they show similarities with both the elements of the group they belong to and elements in neighboring groups.
· They "bridge" the properties of elements across different groups.
Other Options:
· Typical elements: These usually refer to representative elements, not specifically second-period elements.
· Earth metals: This term refers to alkaline earth metals (Group 2 elements), not all second-period elements.
· Transition elements: These are elements in the d-block, whereas second-period elements are found in the p-block (except for hydrogen and helium).