Overview: Notes on Periodic Table & Classification of Elements
General Science Chemistry portion me Periodic Table & Classification of Elements ek foundational aur high-scoring topic hai. RRB NTPC, SSC CGL, SSC CHSL aur State Exams me Dobereiner’s Triads, Newlands’ Law of Octaves, Mendeleev’s Periodic Table, aur Henry Moseley ki Modern Periodic Law par har saal direct conceptual questions puche jaate hain.
Key Exam Highlights Covered in this PDF
- Historical Evolution: Dobereiner’s Triads, Newlands’ Octaves, aur Mendeleev’s Periodic Table ki limitations.
- Modern Periodic Table (Moseley): Atomic Number-based classification, 18 Groups, aur 7 Periods.
- Block-wise Division: s-block, p-block, d-block (Transition elements), aur f-block (Inner Transition elements).
- Periodic Property Trends: Atomic Radius, Ionization Potential, Electron Affinity, aur Electronegativity ke variation trends.
PDF Material Details
| Attribute | Specification Details |
|---|---|
| Topic Name | Notes on Periodic Table & Classification of Elements |
| Category | General Science — Inorganic Chemistry |
| Language | English / Hindi Mix (Aspirant Friendly) |
| Target Exams | RRB NTPC, SSC CGL, SSC CHSL, RRB JE, State PSCs |
| Core Focus | Modern Periodic Law, Block Divisions, Periodic Trends & PYQs |
Practice MCQs on Periodic Table Trends
Apni concept clarity aur speed check karne ke liye niche di gayi 15 high-yield MCQs solve karein:
Q1. Who proposed the Modern Periodic Law based on Atomic Numbers?
Check Answer
Answer: Henry Moseley (1913). Modern Periodic Law states that physical and chemical properties of elements are periodic functions of their atomic numbers.
Q2. How many Groups and Periods are present in the Modern Periodic Table?
Check Answer
Answer: 18 Vertical Groups and 7 Horizontal Periods.
Q3. As you move from Left to Right across a Period, atomic size generally:
Check Answer
Answer: Decreases. (Due to an increase in effective nuclear charge pulling valence electrons closer to the nucleus).
Q4. Which element has the highest electronegativity in the entire Periodic Table?
Check Answer
Answer: Fluorine (F) with a Pauling scale value of 4.0.
Q5. Group 18 elements in the Modern Periodic Table are known as:
Check Answer
Answer: Noble Gases / Inert Gases (Helium, Neon, Argon, Krypton, Xenon, Radon).
Q6. Elements belonging to d-block in the Periodic Table are commonly called:
Check Answer
Answer: Transition Elements (Groups 3 to 12).
Q7. Which law stated that “properties of the eighth element are similar to the first element”?
Check Answer
Answer: Newlands’ Law of Octaves (1865).
Q8. Group 1 metals (except Hydrogen) are collectively termed as:
Check Answer
Answer: Alkali Metals (Lithium, Sodium, Potassium, Rubidium, Cesium, Francium).
Q9. Moving Down a Group in the Periodic Table, metallic character:
Check Answer
Answer: Increases. (As atomic radius increases, losing electrons becomes easier).
Q10. What are f-block elements situated at the bottom of the Periodic Table called?
Check Answer
Answer: Inner Transition Elements (Lanthanides and Actinides).
Q11. Which group elements are known as Halogens?
Check Answer
Answer: Group 17 (Fluorine, Chlorine, Bromine, Iodine, Astatine).
Q12. What was the main basis of Mendeleev’s Periodic Table?
Check Answer
Answer: Increasing order of Atomic Masses (Atomic Weights).
Q13. Which element has the highest Electron Affinity?
Check Answer
Answer: Chlorine (Cl).
Q14. What are elements showing properties of both metals and non-metals called?
Check Answer
Answer: Metalloids / Semimetals (e.g., Silicon, Germanium, Arsenic).
Q15. Group 2 elements in the Periodic Table are named as:
Check Answer
Answer: Alkaline Earth Metals (Beryllium, Magnesium, Calcium, Strontium, Barium, Radium).
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FAQs: Notes on Periodic Table & Classification of Elements
Q1: What is the main difference between Mendeleev's and Moseley's Periodic Law?
Ans: Mendeleev arranged elements based on increasing atomic masses, whereas Moseley arranged elements based on increasing atomic numbers in the Modern Periodic Table.
Q2: Why does Electronegativity increase across a period from left to right?
Ans: As nuclear charge increases across a period, the electrostatic pull on shared valence electrons strengthens, leading to higher electronegativity.
Q3: Which period in the Modern Periodic Table is the shortest?
Ans: Period 1 is the shortest period, containing only 2 elements: Hydrogen (H) and Helium (He).
Q4: How can I download Periodic Table Notes PDF for free on SarkariExamPDF?
Ans: Scroll up to the download section, click "Click to Get Download Link", wait for 10 seconds, and your direct Google Drive download button will appear.
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