What does below chemistry rebus means?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

Move four matchsticks to the below square to form three squares?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

One day Jenifer meets the Lion and the Tiger in the Forest of Forgetfulness. She knows that the Lion lies on Mondays, Tuesdays, and Wednesdays, and tells the truth on the other days of the week. The Tiger, on the other hand, lies on Thursdays, Fridays, and Saturdays, but tells the truth on the other days of the week. Now they make the following statements to Jenifer:

Lion: Yesterday was one of my lying days.

Tiger: Yesterday was one of my lying days too.

What day is it?

There is a place where if I stand up straight, I will still be considered sideways.

What has a bottom at the top?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?