What's the next in the series?

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

How can you take 2 from 5 and leave 4?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

I can write cow in 13 letters.

Can You?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

What is next number in the pattern below:

131 517 192 123 ?