What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Solve this riddle by finding the odd one out from the rest.

There are forty elephants and they have forty-fore heads. How can this be possible?

Can you name some countries which do not have the alphabet 'A' in them?

The following question it puts forth you:

25 - 55 + (85 + 65) = ?

Then, you are told that even though you might think it's wrong, the correct answer is actually 5!

Whats your reaction to it? How can this be true?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?