Question

why sodium and potassium aren't used in construction of bridges​

Answer 1

Answer:

Metals (except sodium, potassium) have very high tensile strength.

For example - iron can bear a lot of tensile strength. So, it is used in construction of buildings, bridges, railway lines etc.

Explanation:

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Answer 2

Answer:

Sodium and potassium are used in construction of bridges because they are the most reactive metals and they can react to water easily as Bridge has a chance of getting wet with water so bridges cannot be made by Sodium and potassium