11. What is so special about a Prince Rupert's drop? O (1) Both the head and the tail are strong.
O (2) Both the head and the tail are weak.
(3) The head is strong and the tail is weak.
(4) The head is weak and the tail is strong.

the answer to your question is (4)

Explanation:

Prince Rupert's Drops: The Exploding Glass Teardrop ... Prince Rupert's drops (also called Batavian tears) are thermally tempered, tadpole-shaped globules of glass. These drops have an extremely hard “bulb,” but a very weak “tail.” The bulb can survive hammer blows, but a light touch can snap the tail and shatter the entire bulb.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.