Question

What are the similarities between the modern periodic table and Mendeleev's periodic table?

Answer 1

Similarities between the modern periodic table and Mendeleev's periodic table:

• Metals and non-metals are placed separately in both periodic tables.
• The elements are arranged in groups and periods.
• Hydrogen is placed in the first row in both tables.
• Elements from Lithium to Neon are placed in the second row.
• All the elements in the same group have similar chemical properties.
• The number pf groups and periods are different.