What's the next in the series?

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

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

What does this below rebus puzzle mean?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Why do people go to bed?

What brings you down but never up?