My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

What type of tree can I carry in my hand?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?