What is so fragile that saying its name breaks it?

What's the next in the series?

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

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What has a bottom at the top?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

How many triangles are there on the puzzle below?

Solve the mathematical equation in the picture below.

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?