Chemistry teacher

 - Dr.Sanjaykumar Pawar    Chemistry Teacher IQ: free notes, MCQs and mock tests for CBSE, NEET and JEE chemistry. Atomic Models for NEET: Thomson Plum Pudding & Rutherford Nuclear Model Explained Atomic Models for NEET: Thomson Plum Pudding & Rutherford Nuclear Model Explained Introduction Thomson Rutherford Formulas Numericals Comparison Practice FAQs Introduction What are atomic models? An atomic model is a scientific representation of the internal structure of an atom : how protons, neutrons and electrons are arranged inside it. Atoms are too small to observe directly, so scientists proposed models based on the experimental evidence available at the time. Think of a sealed box. You can't see inside, but by shaking it, weighing it and listening, you can guess what is in it. That is what Thomson, Rutherford and later Bohr did with the atom. Why is this topic important for NEET? Atomic models are the foundation of the "Structure of Atom...

  KÖssel–Lewis Approach to Chemical Bonding — NEET  Notes Class 11 CBSE Chemistry: Chemical Bonding and Molecular Structure – Complete Question Bank 1. Basic idea Kössel and Lewis independently explained chemical bonding in 1916 . They were among the first to give a logical explanation of valency . Their explanation was based on the stability/inertness of noble gases . Main idea: Atoms form chemical bonds to achieve a stable electronic configuration , generally similar to that of a noble gas. ⭐ NEET Key Point Atoms tend to achieve a stable outer shell, usually an octet of 8 electrons. 2. Lewis's picture of an atom Lewis divided an atom conceptually into two parts: (a) Kernel The kernel consists of: nucleus inner-shell electrons These inner electrons generally do not participate in bonding . (b) Outer shell The outermost shell contains the valence electrons . Lewis imagined a maximum of 8 electrons in the outer shell. He represented these 8 pos...

Chemical Bonding and Molecular Structure — Basic Introduction  Class 11 CBSE Chemistry: Chemical Bonding and Molecular Structure – Complete Question Bank 1. Matter is made up of one or different types of elements. Easy meaning: All matter around us is made up of elements . An element contains only one type of atom . Examples: Hydrogen (H), Oxygen (O), Sodium (Na), Chlorine (Cl). NEET point: 👉 Matter → Elements → Atoms 2. Under normal conditions, no other element exists as an independent atom in nature, except noble gases. Easy meaning: Most elements do not remain as single, separate atoms in nature. They usually combine with other atoms to become more stable. Noble gases are an important exception. Examples of noble gases: He, Ne, Ar, Kr, Xe, Rn Why are noble gases stable? Their outermost shell is completely filled. Therefore, they generally do not need to form chemical bonds. NEET point: 👉 Noble gases generally exist as monoatomic gases . 3. A group of atoms is found to exist ...