Spot what is wrong here in below Picture?

What's the next in the series?

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

Buy me, smell me or deliver me, I do not change.

Who am I?

In the given picture, you can find two letters missing. When two particular letters are placed in the missing spots, you get an eight-letter word while reading in the anti-clockwise direction. Can you find out the missing letters and the missing word eventually?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

I add 5 to 9 and get 2. The answer is correct, so what am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?