Class 9 Chemistry | New Book Chapter 2 Lecture 7 | Atomic Number and Mass Number 🔢 | Punjab Board скачать в хорошем качестве

Class 9 Chemistry | New Book Chapter 2 Lecture 7 | Atomic Number and Mass Number 🔢 | Punjab Board

Complete Lecture Series: Class 9 Chemistry | Complete New Book (Chapters 1-13) | Punjab Board 🔥📘    • Class 9 Chemistry | Complete New Book (Cha...   🚀 Welcome to Chapter 2 of Class 9 Chemistry – Atomic Number and Mass Number! In this lecture, we delve into the fundamental concepts of atomic number and mass number, which are crucial for understanding the structure of atoms and the periodic table. This session aligns with the curriculum of the Board of Intermediate and Secondary Education (Punjab). 📘 Topics Covered in This Lecture: 🔹 Atomic Number (Z):     • Definition: The number of protons in the nucleus of an atom.     • Significance: Determines the element's identity and its position in the periodic table.     • Examples: Hydrogen (Z=1), Carbon (Z=6), Oxygen (Z=8). 🔹 Mass Number (A):     • Definition: The total number of protons and neutrons in an atom's nucleus.     • Calculation: A = Number of Protons (Z) + Number of Neutrons (N).     • Examples: Carbon-12 (A=12), Oxygen-16 (A=16). 🔹 Isotopes:     • Explanation: Atoms of the same element (same Z) but different mass numbers (A) due to varying numbers of neutrons.     • Examples: Carbon-12, Carbon-14; Uranium-235, Uranium-238. 🔹 Determining Neutron Number:     • Formula: Number of Neutrons (N) = Mass Number (A) - Atomic Number (Z).     • Practice Problems: Calculating the number of neutrons in various isotopes. 🔹 Representation of Elements:     • Standard Notation: 𝑍 𝐴 X Z A ​ X, where X is the chemical symbol, A is the mass number, and Z is the atomic number.     • Example: 6 14 C 6 14 ​ C represents Carbon-14. This lecture is specially designed for Class 9 students under the Punjab Board system, including: Board of Intermediate and Secondary Education, Lahore Board of Intermediate and Secondary Education, Faisalabad Board of Intermediate and Secondary Education, Multan Board of Intermediate and Secondary Education, Rawalpindi Board of Intermediate and Secondary Education, Sargodha Board of Intermediate and Secondary Education, Dera Ghazi Khan Board of Intermediate and Secondary Education, Bahawalpur Board of Intermediate and Secondary Education, Gujranwala Board of Intermediate and Secondary Education, Sahiwal ✅ Watch till the end for exam-focused explanations and key insights that will help you excel in your Board exams! 📌 Stay Connected: 👉 Like, share, and subscribe for more exam-focused Chemistry lectures and complete Punjab Board syllabus coverage! #Class9Chemistry #AtomicNumber #MassNumber #Isotopes #AtomicStructure #PunjabBoard #NewBook2025 #ChemistryLecture #StudyWithMe #LearnChemistry #LahoreBoard #FaisalabadBoard #MultanBoard #RawalpindiBoard #SargodhaBoard #GujranwalaBoard #SahiwalBoard #ExamPreparation #EducationalContent #ScienceForPakistan