In what ways, the modern periodic table is more advanced than Mendeleev's periodic table? Mention any two points. Write two differences between p-block and s-block elements.

Question

Arpit Sundas · Accepted Answer

The modern periodic table is more advanced than Mendeleev's periodic table because of the following reasons:

1.Mendeleev's Table: Elements were arranged based on increasing atomic mass.

Modern Table: Elements are organized according to increasing atomic number (the number of protons in the nucleus)

2.Mendeleev's Table: Included about 63 known elements at the time.

Modern Table: Contains approximately 118 elements, reflecting discoveries made since Mendeleev's time.

Differences between p-block and s-block elements are:

p-block	s-block
1. The p-block elements have p-sub-shell as the last orbital.	1. The s-block elements have s-sub-shell as the last orbital.
2.They can have 1 to 6 electrons in the last sub-shell.	2.They can have 1 or 2 electrons in the last sub-shell.