p-Block Elements-I — Flashcards
Tamil Nadu Board · Class 12 · Chemistry
30 flashcards for p-Block Elements-I (Tamil Nadu Board Class 12 Chemistry) to test yourself on key terms and facts.
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What is the general electronic configuration of p-block elements?
Answer
p-block elements have the general electronic configuration: ns² np¹⁻⁶ Where: - n is the principal quantum number (increases down the group) - ns² indicates the completely filled s-orbital - np¹⁻⁶ ind…
Why are Group 18 elements (inert gases) called inert?
Answer
Group 18 elements have completely filled p-orbitals with the configuration ns² np⁶. Reasons for inertness: 1. Complete valence shell with 8 electrons (octet) 2. Maximum stability due to filled p-orbi…
What is the highest oxidation state (group oxidation state) for Group 13, 14, and 15 elements?
Answer
The group oxidation state equals the total number of valence electrons: Group 13 (ns² np¹): Highest oxidation state = +3 Group 14 (ns² np²): Highest oxidation state = +4 Group 15 (ns² np³): Highest o…
Explain the inert pair effect with an example.
Answer
The inert pair effect is the reluctance of the outermost s electrons (ns) to participate in bonding in heavier p-block elements. Reason: Poor shielding effect of inner d and f electrons causes high e…
What is allotropism? Give examples from p-block elements.
Answer
Allotropism is the phenomenon where an element exists in two or more different crystalline or molecular forms in the same physical state. Common p-block allotropes: Carbon: Diamond (tetrahedral bond…
Compare diamond and graphite structures and explain their properties.
Answer
DIAMOND Structure: - sp³ hybridization (tetrahedral bonding) - Each C atom bonded to 4 other C atoms by σ bonds - C-C bond length: 1.54 Å - 3D network structure - No mobile electrons Properties: Hard…
What is catenation? Which p-block element shows the strongest catenation?
Answer
Catenation is the ability of an element to form chains of atoms bonded to itself. Conditions necessary for catenation: 1. Valency ≥ 2 2. Ability to bond with itself 3. Self-bonds as strong as bonds w…
Explain the anomalous properties of boron compared to other Group 13 elements.
Answer
Boron shows anomalous properties due to: 1. Small atomic size (1.92 Å) 2. High ionization enthalpy 3. High electronegativity 4. Absence of d-orbitals in valence shell 5. High nuclear charge to size ra…
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