What is this symbol?

This element symbol means;

This is the first element in the Periodic Table of Elements. Name it.

Name this element.

This element is the most common reason of poisoning during 19's. Name this element.

This element has variety of uses, including its wide medical contributions in facilities and medicines. What is this element?

Name two (2) example of gas element.

Listed below are examples of metallic elements EXCEPT;

Bonus Point. Know my Birthdate by solving the ff. expression;

March √82-1, 1990