Classification of Elements- The Periodic Table
Telangana Board · Class 10 · Physical Sciences
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What is Döbereiner's Law of Triads?
Answer
When elements with similar properties are arranged in groups of three (triads) in ascending order of their atomic weights, the atomic weight of the middle element is approximately the average of the a…
State Newlands' Law of Octaves.
Answer
When elements are arranged in ascending order of their atomic weights, every eighth element has similar properties to the first element, just like musical octaves. However, this law failed for element…
What is Mendeleev's Periodic Law?
Answer
The physical and chemical properties of elements are periodic functions of their atomic weights. Mendeleev arranged elements in increasing order of atomic weights and predicted properties of missing e…
What are the main limitations of Mendeleev's Periodic Table?
Answer
1. Anomalous pairs: Elements with higher atomic weight placed before those with lower atomic weight (Te before I) 2. Dissimilar elements in same group (alkali metals with coinage metals) 3. No place f…
State the Modern Periodic Law.
Answer
The physical and chemical properties of elements are periodic functions of their atomic numbers. This law was proposed after Moseley's discovery that atomic number is more fundamental than atomic weig…
How many groups and periods are there in the modern periodic table?
Answer
The modern periodic table has 18 groups (vertical columns) and 7 periods (horizontal rows). Groups are numbered 1-18 according to IUPAC recommendations, replacing the old A and B subgroup system.
What determines the period number of an element?
Answer
The period number is determined by the number of electron shells (energy levels) in the atom. For example, hydrogen and helium have 1 shell (Period 1), lithium to neon have 2 shells (Period 2), and so…
What determines the group number of an element?
Answer
The group number is determined by the number of valence electrons (electrons in the outermost shell). Elements with the same number of valence electrons are placed in the same group and show similar c…
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