What does below chemistry rebus means?

For this puzzle, you might have to find logic in something illogical. But hey, it's fun and a healthy little break from your strenuous puzzle-solving sessions.

Can you decipher the meaning in the following cluster of letters?

ITIT,NCENTCENT

No one wants to have it, but if one got it, he does not want to lose it. What is It?

If six children and two dogs were under an umbrella, how come none of them got wet?

What does below Rebus say?

XLR8

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What is black when you buy it, red when you use it, and gray when you throw it away?

Can you count the number of lines in the below picture?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.