Question

describe one way the modern periodic table is similar to mendeleevs chart and one way it is different. you can begin your response with: one way the two tables are similar is... one way the two tables are different is... respond in 2 to 3 complete sentences.

Explanation:

• Similarity: Both arrange elements by increasing atomic mass (Mendeleev) or atomic number (modern, which relates to mass trends). Elements in groups/families have similar properties in both.
• Difference: Modern table uses atomic number (proton count) as the key organizing factor. Mendeleev's had some elements out of order (by mass). Modern has more elements (newly discovered) and a better - defined structure (like lanthanides and actinides placement).

Answer:

One way the two tables are similar is that elements in groups (families) show similar chemical properties. One way the two tables are different is that the modern periodic table is organized by atomic number (number of protons), while Mendeleev's was primarily by atomic mass (with some inconsistencies).