Periods in Modern Periodic Table

Q. Why are noble gases called 'noble'?

Q.

What are the salient properties of the modern or long-form periodic table?

Q.

What is periodic table

Q. Can we drink D₂O and T₂O (heavy water)? Wont it show any adverse reaction?

Q. Is modern periodic table different from general periodic table?

Q.

Do phosphorus and potassium shows any similarities between their chemical and physical properties? If yes then why? Or no then why?

Q.

The longest period in the modern periodic table is

1. 6th

2. 4th

3. 2nd and 3rd both

4. 5th