Periodic Classification of Elements
NIOS · Class 10 · Science & Tech
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See them allWhy was classification of elements necessary in the 19th century?
Answer
By the mid-19th century, over 60 elements were known, making it difficult to study their properties individually. Classification helped group similar elements together, making systematic study easier …
In Dobereiner's triad of Li (7), Na (23), K (39), verify if the law holds true.
Answer
Yes, it holds true. The atomic mass of the middle element Na (23) equals the arithmetic mean of Li and K: (7 + 39)/2 = 23. Also, sodium's properties are intermediate between lithium and potassium.
What is Newlands' Law of Octaves?
Answer
When elements are arranged in increasing order of atomic masses, every eighth element has properties similar to the first element. This pattern resembles musical octaves where every eighth note repeat…
Why did Newlands' Law of Octaves fail for elements heavier than calcium?
Answer
The law failed because: 1) It couldn't accommodate elements beyond atomic mass 40u, 2) Discovery of noble gases showed the ninth element (not eighth) had similar properties, 3) Only about half the kno…
State Mendeleev's Periodic Law.
Answer
The chemical and physical properties of elements are a periodic function of their atomic masses. This means properties repeat at regular intervals when elements are arranged by increasing atomic mass.
How did Mendeleev predict the properties of germanium (eka-silicon)?
Answer
Mendeleev left a blank space below silicon in Group IV and predicted eka-silicon would have: atomic mass ~72, density 5.5 g/cm³, high melting point, and form compounds like MSiO₂. When germanium was d…
Why are cobalt (58.9u) and nickel (58.7u) placed as they are in Mendeleev's table despite their atomic masses?
Answer
Mendeleev prioritized chemical properties over atomic mass. Cobalt's properties matched better with elements before nickel, so he placed it first despite having higher atomic mass. This anomaly was la…
What is the Modern Periodic Law?
Answer
The chemical and physical properties of elements are periodic functions of their atomic numbers. This means when elements are arranged by increasing atomic number, similar properties repeat at regular…
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