Classification of Elements and Periodicity in Properties
Gujarat Board · Class 11 · Chemistry
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What was Dobereiner's Law of Triads and why was it significant?
Answer
Dobereiner's Law of Triads (1829) stated that when elements are arranged in groups of three with similar properties, the atomic weight of the middle element is approximately the average of the other t…
State Newlands' Law of Octaves and its limitations.
Answer
Newlands' Law of Octaves (1865) stated that when elements are arranged in increasing order of atomic weights, every eighth element has properties similar to the first element, like musical octaves. Li…
What is Mendeleev's Periodic Law and how did it differ from previous attempts?
Answer
Mendeleev's Periodic Law: 'The properties of elements are a periodic function of their atomic weights.' Key differences: (1) Left gaps for undiscovered elements (2) Predicted properties of missing ele…
State the Modern Periodic Law and explain why atomic number is more fundamental than atomic mass.
Answer
Modern Periodic Law: 'The physical and chemical properties of elements are periodic functions of their atomic numbers.' Atomic number is more fundamental because: (1) It represents the number of proto…
How many periods and groups are there in the modern periodic table? What do they represent?
Answer
Modern Periodic Table has 7 periods and 18 groups. Periods: Horizontal rows representing elements with the same number of electron shells (same highest principal quantum number n). Groups: Vertical co…
What are s-block elements? Give their general electronic configuration and key characteristics.
Answer
s-block elements: Groups 1 and 2 elements with outermost electrons in s-orbitals. Electronic configuration: ns¹ (Group 1) and ns² (Group 2). Characteristics: (1) All are reactive metals (2) Low ioniza…
Describe p-block elements with their electronic configuration and position in the periodic table.
Answer
p-block elements: Groups 13-18 with outermost electrons in p-orbitals. Electronic configuration: ns²np¹ to ns²np⁶. Position: Right side of periodic table. Include: (1) Metals, non-metals, and metalloi…
What are d-block elements (transition elements)? Give their key properties.
Answer
d-block elements: Groups 3-12 with electrons filling inner d-orbitals. Electronic configuration: (n-1)d¹⁻¹⁰ns⁰⁻². Key properties: (1) All are metals (2) Form colored ions (3) Show variable oxidation s…
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