What's the next in the series?

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

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

What has 13 hearts but no other organs?

Which is heavier: a ton of bricks or a ton of feathers?

I can write cow in 13 letters.

Can You?

What is the below Rebus indicate?

I always drive my customer away.

Who am I?

What can go up a chimney down, but can’t go down a chimney up?

What does below Rebus say?

XLR8

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?