What's the next in the series?

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

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

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

The more you take me, the more you leave me behind.
Who Am I?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

Can you solve the maths in the below-given picture equation?

What's the best place to go shopping in the ocean?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?