What's the only room from which no one can enter or leave

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

What type of tree can I carry in my hand?

Replace the question mark in the picture below.

Aaron, Brad, Christopher, Danny and Elvis decided to play a game of tiddlywinks. In this game they decided that one win will get 1 point for winning, 0 for losing and 1/2 in case of a tie.

They finished the game in alphabetical order and it was found that the scores were different for each person.

Based on the following two statements, can you find out the result of the individual games?
Brad: No one could finish like me, without a loss.
Elvis: No one played worse than me, I finished without a single win.

Which part of London exists in France as well ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

what does the below rebus mean?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?