What is the number of elements in the 3rd period of the modernn periodic table?

If each orbital can accommodate maximum of four electrons,, the number of elements in the third period of the periodic table will be-

The number of elements present in the fifth period of the periodic table is

What is the main characteristic of the last elements in the periods of the periodic table?

What is the total number of elements incorporated till not in the periodic table? Write down the name and symbol of the last element.

What are the number of elements under the second short period?

What are the number of elements under the first short period?

What are the number of elements under second long period?

What arte the number of elements under the very short period?

What are the number of elements under first very long period?

What is the nature of group 1 (1A) elements in the periodic table?