Question

explain how is the modern periodic table different from mendeleevs periodic table?

Explanation:

Mendeleev's periodic table was based on atomic mass, while the modern periodic table is based on atomic number. In Mendeleev's table, some elements were placed out - of - order due to mass irregularities. The modern table arranges elements by the number of protons in the nucleus, which better reflects their chemical properties and periodic trends. Also, the modern periodic table has more elements discovered over time and a more refined group and period structure.

Answer:

The modern periodic table is based on atomic number instead of atomic mass as in Mendeleev's table. It has a more accurate arrangement of elements considering their chemical properties, includes more discovered elements, and has a refined group - period structure.