Question

The classification of elements which is based on atomic number is

• A. Dobereiner's law of Triads
• B. Newland's law of octaves
• C. Modern periodic table
• D. Mandeleeff's periodic table

Answer 1

The Correct Option is C

1. Understanding the Classification Systems:
Various systems have been used to classify elements, but the classification based on the atomic number is a key aspect of the Modern Periodic Table.

• Dobereiner's Law of Triads: This system classified elements into groups of three (triads), where the middle element had an atomic weight approximately equal to the average of the other two. However, this classification was not based on atomic number.
• Newland's Law of Octaves: Newland classified elements based on their atomic masses, where every eighth element shared similar properties. This was also not based on atomic number.
• Mendeleev's Periodic Table: Mendeleev's table was based on atomic masses but laid the foundation for the modern periodic table. It organized elements in a periodic manner and predicted the existence of undiscovered elements, though it did not directly use atomic numbers.
• Modern Periodic Table: The modern periodic table is based on atomic number, where elements are arranged in increasing order of their atomic number. This system fully accounts for the periodic properties of elements and is the one we use today.

2. Conclusion:
The classification based on atomic number is found in the Modern Periodic Table.

Final Answer:
The correct answer is (C) Modern periodic table.